Class: Array

Inherits:
Object show all
Includes:
Enumerable
Defined in:
opal/opal/corelib/array.rb,
opal/opal/corelib/array/pack.rb,
opal/opal/corelib/marshal/write_buffer.rb,
opal/opal/corelib/pattern_matching/base.rb

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Enumerable

#all?, #chunk, #chunk_while, #collect_concat, #detect, #drop_while, #each_cons, #each_entry, #each_slice, #each_with_index, #each_with_object, #entries, #enumerator_size, #filter_map, #find_all, #find_index, #grep, #grep_v, #group_by, #inject, #lazy, #max_by, #min_by, #minmax, #minmax_by, #none?, #one?, #partition, #slice_after, #slice_before, #slice_when, #sort_by, #sum, #tally

Constructor Details

#initialize(size = nil, obj = nil, &block) ⇒ Array

Returns a new instance of Array.



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# File 'opal/opal/corelib/array.rb', line 77

def initialize(size = nil, obj = nil, &block)
  %x{
    if (obj !== nil && block !== nil) {
      #{::Kernel.warn('warning: block supersedes default value argument')}
    }

    if (size > #{::Integer::MAX}) {
      #{::Kernel.raise ::ArgumentError, 'array size too big'}
    }

    if (arguments.length > 2) {
      #{::Kernel.raise ::ArgumentError, "wrong number of arguments (#{`arguments.length`} for 0..2)"}
    }

    if (arguments.length === 0) {
      self.splice(0, self.length);
      return self;
    }

    if (arguments.length === 1) {
      if (size.$$is_array) {
        #{replace(size.to_a)}
        return self;
      } else if (#{size.respond_to? :to_ary}) {
        #{replace(size.to_ary)}
        return self;
      }
    }

    size = $coerce_to(size, #{::Integer}, 'to_int');

    if (size < 0) {
      #{::Kernel.raise ::ArgumentError, 'negative array size'}
    }

    self.splice(0, self.length);
    var i, value;

    if (block === nil) {
      for (i = 0; i < size; i++) {
        self.push(obj);
      }
    }
    else {
      for (i = 0, value; i < size; i++) {
        value = block(i);
        self[i] = value;
      }
    }

    return self;
  }
end

Class Method Details

.[](*objects) ⇒ Object 



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# File 'opal/opal/corelib/array.rb', line 73

def self.[](*objects)
  `toArraySubclass(objects, self)`
end

.inherited(klass) ⇒ Object 



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# File 'opal/opal/corelib/array.rb', line 2425

def self.inherited(klass)
  %x{
    klass.$$prototype.$to_a = function() {
      return this.slice(0, this.length);
    }
  }
end

.try_convert(obj) ⇒ Object 



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# File 'opal/opal/corelib/array.rb', line 131

def self.try_convert(obj)
  ::Opal.coerce_to? obj, ::Array, :to_ary
end

Instance Method Details

#&(other) ⇒ Object 



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# File 'opal/opal/corelib/array.rb', line 135

def &(other)
  other = if ::Array === other
            other.to_a
          else
            `$coerce_to(other, #{::Array}, 'to_ary')`.to_a
          end

  %x{
    var result = [], hash = #{{}}, i, length, item;

    for (i = 0, length = other.length; i < length; i++) {
      $hash_put(hash, other[i], true);
    }

    for (i = 0, length = self.length; i < length; i++) {
      item = self[i];
      if ($hash_delete(hash, item) !== undefined) {
        result.push(item);
      }
    }

    return result;
  }
end

#*(other) ⇒ Object 



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# File 'opal/opal/corelib/array.rb', line 182

def *(other)
  return join(other.to_str) if other.respond_to? :to_str

  other = `$coerce_to(other, #{::Integer}, 'to_int')`

  if `other < 0`
    ::Kernel.raise ::ArgumentError, 'negative argument'
  end

  %x{
    var result = [],
        converted = #{to_a};

    for (var i = 0; i < other; i++) {
      result = result.concat(converted);
    }

    return result;
  }
end

#+(other) ⇒ Object 



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# File 'opal/opal/corelib/array.rb', line 203

def +(other)
  other = if ::Array === other
            other.to_a
          else
            `$coerce_to(other, #{::Array}, 'to_ary')`.to_a
          end

  `self.concat(other)`
end

#-(other) ⇒ Object 



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# File 'opal/opal/corelib/array.rb', line 213

def -(other)
  other = if ::Array === other
            other.to_a
          else
            `$coerce_to(other, #{::Array}, 'to_ary')`.to_a
          end

  return [] if `self.length === 0`
  return `self.slice()` if `other.length === 0`

  %x{
    var result = [], hash = #{{}}, i, length, item;

    for (i = 0, length = other.length; i < length; i++) {
      $hash_put(hash, other[i], true);
    }

    for (i = 0, length = self.length; i < length; i++) {
      item = self[i];
      if ($hash_get(hash, item) === undefined) {
        result.push(item);
      }
    }

    return result;
  }
end

#<<(object) ⇒ Object 



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# File 'opal/opal/corelib/array.rb', line 241

def <<(object)
  `self.push(object)`

  self
end

#<=>(other) ⇒ Object 



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# File 'opal/opal/corelib/array.rb', line 247

def <=>(other)
  if ::Array === other
    other = other.to_a
  elsif other.respond_to? :to_ary
    other = other.to_ary.to_a
  else
    return
  end

  %x{
    if (#{hash} === #{other.hash}) {
      return 0;
    }

    var count = Math.min(self.length, other.length);

    for (var i = 0; i < count; i++) {
      var tmp = #{`self[i]` <=> `other[i]`};

      if (tmp !== 0) {
        return tmp;
      }
    }

    return #{`self.length` <=> `other.length`};
  }
end

#==(other) ⇒ Object 



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# File 'opal/opal/corelib/array.rb', line 275

def ==(other)
  %x{
    var recursed = {};

    function _eqeq(array, other) {
      var i, length, a, b;

      if (array === other)
        return true;

      if (!other.$$is_array) {
        if ($respond_to(other, '$to_ary')) {
          return #{`other` == `array`};
        } else {
          return false;
        }
      }

      if (array.$$constructor !== Array)
        array = #{`array`.to_a};
      if (other.$$constructor !== Array)
        other = #{`other`.to_a};

      if (array.length !== other.length) {
        return false;
      }

      recursed[#{`array`.object_id}] = true;

      for (i = 0, length = array.length; i < length; i++) {
        a = array[i];
        b = other[i];
        if (a.$$is_array) {
          if (b.$$is_array && b.length !== a.length) {
            return false;
          }
          if (!recursed.hasOwnProperty(#{`a`.object_id})) {
            if (!_eqeq(a, b)) {
              return false;
            }
          }
        } else {
          if (!#{`a` == `b`}) {
            return false;
          }
        }
      }

      return true;
    }

    return _eqeq(self, other);
  }
end

#[](index, length = undefined) ⇒ Object Also known as: slice 



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# File 'opal/opal/corelib/array.rb', line 429

def [](index, length = undefined)
  %x{
    if (index.$$is_range) {
      return $array_slice_range(self, index);
    }
    else if (index.$$is_arithmetic_seq) {
      return $array_slice_arithmetic_seq(self, index);
    }
    else {
      return $array_slice_index_length(self, index, length);
    }
  }
end

#[]=(index, value, extra = undefined) ⇒ Object 



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# File 'opal/opal/corelib/array.rb', line 443

def []=(index, value, extra = undefined)
  data = nil
  %x{
    var i, size = self.length;

    if (index.$$is_range) {
      if (value.$$is_array)
        data = #{value.to_a};
      else if (#{value.respond_to? :to_ary})
        data = #{value.to_ary.to_a};
      else
        data = [value];

      var exclude = index.excl,
          from    = index.begin === nil ? 0 : $coerce_to(index.begin, Opal.Integer, 'to_int'),
          to      = index.end === nil ? -1 : $coerce_to(index.end, Opal.Integer, 'to_int');

      if (from < 0) {
        from += size;

        if (from < 0) {
          #{::Kernel.raise ::RangeError, "#{index.inspect} out of range"};
        }
      }

      if (to < 0) {
        to += size;
      }

      if (!exclude || index.end === nil) {
        to += 1;
      }

      if (from > size) {
        for (i = size; i < from; i++) {
          self[i] = nil;
        }
      }

      if (to < 0) {
        self.splice.apply(self, [from, 0].concat(data));
      }
      else {
        self.splice.apply(self, [from, to - from].concat(data));
      }

      return value;
    } else {
      if (extra === undefined) {
        #{length = 1}
      } else {
        length = value;
        value  = extra;

        if (value.$$is_array)
          data = #{value.to_a};
        else if (#{value.respond_to? :to_ary})
          data = #{value.to_ary.to_a};
        else
          data = [value];
      }

      var old;

      index  = $coerce_to(index, #{::Integer}, 'to_int');
      length = $coerce_to(length, #{::Integer}, 'to_int');

      if (index < 0) {
        old    = index;
        index += size;

        if (index < 0) {
          #{::Kernel.raise ::IndexError, "index #{`old`} too small for array; minimum #{`-self.length`}"};
        }
      }

      if (length < 0) {
        #{::Kernel.raise ::IndexError, "negative length (#{length})"}
      }

      if (index > size) {
        for (i = size; i < index; i++) {
          self[i] = nil;
        }
      }

      if (extra === undefined) {
        self[index] = value;
      }
      else {
        self.splice.apply(self, [index, length].concat(data));
      }

      return value;
    }
  }
end

#__marshal__(buffer) ⇒ Object 



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# File 'opal/opal/corelib/marshal/write_buffer.rb', line 49

def __marshal__(buffer)
  buffer.save_link(self)
  buffer.write_ivars_prefix(self)
  buffer.write_extends(self)
  buffer.write_user_class(::Array, self)
  buffer.append('[')
  buffer.write_array(self)
  buffer.write_ivars_suffix(self)
end

#any?(pattern = undefined, &block) ⇒ Boolean

Returns:



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# File 'opal/opal/corelib/array.rb', line 541

def any?(pattern = undefined, &block)
  `if (self.length === 0) return false`
  super
end

#assoc(object) ⇒ Object 



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# File 'opal/opal/corelib/array.rb', line 546

def assoc(object)
  %x{
    for (var i = 0, length = self.length, item; i < length; i++) {
      if (item = self[i], item.length && #{`item[0]` == object}) {
        return item;
      }
    }

    return nil;
  }
end

#at(index) ⇒ Object 



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# File 'opal/opal/corelib/array.rb', line 558

def at(index)
  %x{
    index = $coerce_to(index, #{::Integer}, 'to_int')

    if (index < 0) {
      index += self.length;
    }

    if (index < 0 || index >= self.length) {
      return nil;
    }

    return self[index];
  }
end

#bsearch(&block) ⇒ Object 



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# File 'opal/opal/corelib/array.rb', line 613

def bsearch(&block)
  return enum_for :bsearch unless block_given?

  index = bsearch_index(&block)

  %x{
    if (index != null && index.$$is_number) {
      return self[index];
    } else {
      return index;
    }
  }
end

#bsearch_index(&block) ⇒ Object 



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# File 'opal/opal/corelib/array.rb', line 574

def bsearch_index(&block)
  return enum_for :bsearch_index unless block_given?

  %x{
    var min = 0,
        max = self.length,
        mid,
        val,
        ret,
        smaller = false,
        satisfied = nil;

    while (min < max) {
      mid = min + Math.floor((max - min) / 2);
      val = self[mid];
      ret = $yield1(block, val);

      if (ret === true) {
        satisfied = mid;
        smaller = true;
      }
      else if (ret === false || ret === nil) {
        smaller = false;
      }
      else if (ret.$$is_number) {
        if (ret === 0) { return mid; }
        smaller = (ret < 0);
      }
      else {
        #{::Kernel.raise ::TypeError, "wrong argument type #{`ret`.class} (must be numeric, true, false or nil)"}
      }

      if (smaller) { max = mid; } else { min = mid + 1; }
    }

    return satisfied;
  }
end

#clear ⇒ Object 



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# File 'opal/opal/corelib/array.rb', line 670

def clear
  `self.splice(0, self.length)`

  self
end

#collect(&block) ⇒ Object Also known as: map 



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# File 'opal/opal/corelib/array.rb', line 688

def collect(&block)
  return enum_for(:collect) { size } unless block_given?

  %x{
    var result = [];

    for (var i = 0, length = self.length; i < length; i++) {
      var value = $yield1(block, self[i]);
      result.push(value);
    }

    return result;
  }
end

#collect!(&block) ⇒ Object Also known as: map! 



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# File 'opal/opal/corelib/array.rb', line 703

def collect!(&block)
  return enum_for(:collect!) { size } unless block_given?

  %x{
    for (var i = 0, length = self.length; i < length; i++) {
      var value = $yield1(block, self[i]);
      self[i] = value;
    }
  }

  self
end

#combination(n) ⇒ Object 



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# File 'opal/opal/corelib/array.rb', line 730

def combination(n)
  num = ::Opal.coerce_to! n, ::Integer, :to_int
  return enum_for(:combination, num) { `binomial_coefficient(#{self}.length, num)` } unless block_given?

  %x{
    var i, length, stack, chosen, lev, done, next;

    if (num === 0) {
      #{yield []}
    } else if (num === 1) {
      for (i = 0, length = self.length; i < length; i++) {
        #{yield `[self[i]]`}
      }
    }
    else if (num === self.length) {
      #{yield `self.slice()`}
    }
    else if (num >= 0 && num < self.length) {
      stack = [];
      for (i = 0; i <= num + 1; i++) {
        stack.push(0);
      }

      chosen = [];
      lev = 0;
      done = false;
      stack[0] = -1;

      while (!done) {
        chosen[lev] = self[stack[lev+1]];
        while (lev < num - 1) {
          lev++;
          next = stack[lev+1] = stack[lev] + 1;
          chosen[lev] = self[next];
        }
        #{ yield `chosen.slice()` }
        lev++;
        do {
          done = (lev === 0);
          stack[lev]++;
          lev--;
        } while ( stack[lev+1] + num === self.length + lev + 1 );
      }
    }
  }
  self
end

#compact ⇒ Object 



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# File 'opal/opal/corelib/array.rb', line 806

def compact
  %x{
    var result = [];

    for (var i = 0, length = self.length, item; i < length; i++) {
      if ((item = self[i]) !== nil) {
        result.push(item);
      }
    }

    return result;
  }
end

#compact! ⇒ Object 



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# File 'opal/opal/corelib/array.rb', line 820

def compact!
  %x{
    var original = self.length;

    for (var i = 0, length = self.length; i < length; i++) {
      if (self[i] === nil) {
        self.splice(i, 1);

        length--;
        i--;
      }
    }

    return self.length === original ? nil : self;
  }
end

#concat(*others) ⇒ Object 



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# File 'opal/opal/corelib/array.rb', line 837

def concat(*others)
  others = others.map do |other|
    other = if ::Array === other
              other.to_a
            else
              `$coerce_to(other, #{::Array}, 'to_ary')`.to_a
            end

    if other.equal?(self)
      other = other.dup
    end

    other
  end

  others.each do |other|
    %x{
      for (var i = 0, length = other.length; i < length; i++) {
        self.push(other[i]);
      }
    }
  end

  self
end

#count(object = undefined, &block) ⇒ Object 



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# File 'opal/opal/corelib/array.rb', line 676

def count(object = undefined, &block)
  if `object !== undefined` || block
    super
  else
    size
  end
end

#cycle(n = nil, &block) ⇒ Object 



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# File 'opal/opal/corelib/array.rb', line 627

def cycle(n = nil, &block)
  unless block_given?
    return enum_for(:cycle, n) do
      if n.nil?
        ::Float::INFINITY
      else
        n = ::Opal.coerce_to!(n, ::Integer, :to_int)
        n > 0 ? enumerator_size * n : 0
      end
    end
  end

  return if empty? || n == 0

  %x{
    var i, length, value;

    if (n === nil) {
      while (true) {
        for (i = 0, length = self.length; i < length; i++) {
          value = $yield1(block, self[i]);
        }
      }
    }
    else {
      n = #{::Opal.coerce_to!(n, ::Integer, :to_int)};
      if (n <= 0) {
        return self;
      }

      while (n > 0) {
        for (i = 0, length = self.length; i < length; i++) {
          value = $yield1(block, self[i]);
        }

        n--;
      }
    }
  }

  self
end

#deconstruct ⇒ Object 



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# File 'opal/opal/corelib/pattern_matching/base.rb', line 2

def deconstruct
  self
end

#delete(object) ⇒ Object 



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# File 'opal/opal/corelib/array.rb', line 863

def delete(object)
  %x{
    var original = self.length;

    for (var i = 0, length = original; i < length; i++) {
      if (#{`self[i]` == object}) {
        self.splice(i, 1);

        length--;
        i--;
      }
    }

    if (self.length === original) {
      if (#{block_given?}) {
        return #{yield};
      }
      return nil;
    }
    return object;
  }
end

#delete_at(index) ⇒ Object 



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# File 'opal/opal/corelib/array.rb', line 886

def delete_at(index)
  %x{
    index = $coerce_to(index, #{::Integer}, 'to_int');

    if (index < 0) {
      index += self.length;
    }

    if (index < 0 || index >= self.length) {
      return nil;
    }

    var result = self[index];

    self.splice(index, 1);

    return result;
  }
end

#delete_if(&block) ⇒ Object 



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# File 'opal/opal/corelib/array.rb', line 906

def delete_if(&block)
  return enum_for(:delete_if) { size } unless block_given?
  %x{filterIf(self, $falsy, block)}
  self
end

#difference(*arrays) ⇒ Object 



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# File 'opal/opal/corelib/array.rb', line 912

def difference(*arrays)
  arrays.reduce(to_a.dup) { |a, b| a - b }
end

#dig(idx, *idxs) ⇒ Object 



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# File 'opal/opal/corelib/array.rb', line 916

def dig(idx, *idxs)
  item = self[idx]

  %x{
    if (item === nil || idxs.length === 0) {
      return item;
    }
  }

  unless item.respond_to?(:dig)
    ::Kernel.raise ::TypeError, "#{item.class} does not have #dig method"
  end

  item.dig(*idxs)
end

#drop(number) ⇒ Object 



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# File 'opal/opal/corelib/array.rb', line 932

def drop(number)
  %x{
    number = $coerce_to(number, #{::Integer}, 'to_int');

    if (number < 0) {
      #{::Kernel.raise ::ArgumentError}
    }

    return self.slice(number);
  }
end

#dup ⇒ Object 



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# File 'opal/opal/corelib/array.rb', line 944

def dup
  %x{
    if (self.$$class === Opal.Array &&
        self.$$class.$allocate.$$pristine &&
        self.$copy_instance_variables.$$pristine &&
        self.$initialize_dup.$$pristine) {
      return self.slice(0);
    }
  }

  super
end

#each(&block) ⇒ Object 



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# File 'opal/opal/corelib/array.rb', line 957

def each(&block)
  return enum_for(:each) { size } unless block_given?

  %x{
    for (var i = 0, length = self.length; i < length; i++) {
      var value = $yield1(block, self[i]);
    }
  }

  self
end

#each_index(&block) ⇒ Object 



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# File 'opal/opal/corelib/array.rb', line 969

def each_index(&block)
  return enum_for(:each_index) { size } unless block_given?

  %x{
    for (var i = 0, length = self.length; i < length; i++) {
      var value = $yield1(block, i);
    }
  }

  self
end

#empty? ⇒ Boolean

Returns:



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# File 'opal/opal/corelib/array.rb', line 981

def empty?
  `self.length === 0`
end

#eql?(other) ⇒ Boolean

Returns:



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# File 'opal/opal/corelib/array.rb', line 985

def eql?(other)
  %x{
    var recursed = {};

    function _eql(array, other) {
      var i, length, a, b;

      if (!other.$$is_array) {
        return false;
      }

      other = #{other.to_a};

      if (array.length !== other.length) {
        return false;
      }

      recursed[#{`array`.object_id}] = true;

      for (i = 0, length = array.length; i < length; i++) {
        a = array[i];
        b = other[i];
        if (a.$$is_array) {
          if (b.$$is_array && b.length !== a.length) {
            return false;
          }
          if (!recursed.hasOwnProperty(#{`a`.object_id})) {
            if (!_eql(a, b)) {
              return false;
            }
          }
        } else {
          if (!#{`a`.eql?(`b`)}) {
            return false;
          }
        }
      }

      return true;
    }

    return _eql(self, other);
  }
end

#fetch(index, defaults = undefined, &block) ⇒ Object 



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# File 'opal/opal/corelib/array.rb', line 1030

def fetch(index, defaults = undefined, &block)
  %x{
    var original = index;

    index = $coerce_to(index, #{::Integer}, 'to_int');

    if (index < 0) {
      index += self.length;
    }

    if (index >= 0 && index < self.length) {
      return self[index];
    }

    if (block !== nil && defaults != null) {
      #{warn('warning: block supersedes default value argument')}
    }

    if (block !== nil) {
      return block(original);
    }

    if (defaults != null) {
      return defaults;
    }

    if (self.length === 0) {
      #{::Kernel.raise ::IndexError, "index #{`original`} outside of array bounds: 0...0"}
    }
    else {
      #{::Kernel.raise ::IndexError, "index #{`original`} outside of array bounds: -#{`self.length`}...#{`self.length`}"};
    }
  }
end

#fill(*args, &block) ⇒ Object 



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# File 'opal/opal/corelib/array.rb', line 1065

def fill(*args, &block)
  %x{
    var i, length, value;
  }

  if block
    if `args.length > 2`
      ::Kernel.raise ::ArgumentError, "wrong number of arguments (#{args.length} for 0..2)"
    end

    one, two = args
  else
    if `args.length == 0`
      ::Kernel.raise ::ArgumentError, 'wrong number of arguments (0 for 1..3)'
    elsif `args.length > 3`
      ::Kernel.raise ::ArgumentError, "wrong number of arguments (#{args.length} for 1..3)"
    end

    obj, one, two = args
  end

  if ::Range === one
    ::Kernel.raise ::TypeError, 'length invalid with range' if two

    left   = `one.begin === nil ? 0 : $coerce_to(one.begin, #{::Integer}, 'to_int')`
    `left += this.length` if `left < 0`
    ::Kernel.raise ::RangeError, "#{one.inspect} out of range" if `left < 0`

    right = `one.end === nil ? -1 : $coerce_to(one.end, #{::Integer}, 'to_int')`
    `right += this.length` if `right < 0`
    `right += 1` unless one.exclude_end?

    return self if `right <= left`
  elsif one
    left   = `$coerce_to(one, #{::Integer}, 'to_int')`
    `left += this.length` if `left < 0`
    left   = 0 if `left < 0`

    if two
      right = `$coerce_to(two, #{::Integer}, 'to_int')`

      return self if `right == 0`

      `right += left`
    else
      right = `this.length`
    end
  else
    left  = 0
    right = `this.length`
  end

  if `left > this.length`
    %x{
      for (i = this.length; i < right; i++) {
        self[i] = nil;
      }
    }
  end

  if `right > this.length`
    `this.length = right`
  end

  if block
    %x{
      for (length = this.length; left < right; left++) {
        value = block(left);
        self[left] = value;
      }
    }
  else
    %x{
      for (length = this.length; left < right; left++) {
        self[left] = #{obj};
      }
    }
  end

  self
end

#first(count = undefined) ⇒ Object 



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# File 'opal/opal/corelib/array.rb', line 1147

def first(count = undefined)
  %x{
    if (count == null) {
      return self.length === 0 ? nil : self[0];
    }

    count = $coerce_to(count, #{::Integer}, 'to_int');

    if (count < 0) {
      #{::Kernel.raise ::ArgumentError, 'negative array size'};
    }

    return self.slice(0, count);
  }
end

#flatten(level = undefined) ⇒ Object 



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# File 'opal/opal/corelib/array.rb', line 1163

def flatten(level = undefined)
  %x{
    function _flatten(array, level) {
      var result = [],
          i, length,
          item, ary;

      array = #{`array`.to_a};

      for (i = 0, length = array.length; i < length; i++) {
        item = array[i];

        if (!$respond_to(item, '$to_ary', true)) {
          result.push(item);
          continue;
        }

        ary = #{`item`.to_ary};

        if (ary === nil) {
          result.push(item);
          continue;
        }

        if (!ary.$$is_array) {
          #{::Kernel.raise ::TypeError};
        }

        if (ary === self) {
          #{::Kernel.raise ::ArgumentError};
        }

        switch (level) {
        case undefined:
          result = result.concat(_flatten(ary));
          break;
        case 0:
          result.push(ary);
          break;
        default:
          result.push.apply(result, _flatten(ary, level - 1));
        }
      }
      return result;
    }

    if (level !== undefined) {
      level = $coerce_to(level, #{::Integer}, 'to_int');
    }

    return _flatten(self, level);
  }
end

#flatten!(level = undefined) ⇒ Object 



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# File 'opal/opal/corelib/array.rb', line 1217

def flatten!(level = undefined)
  %x{
    var flattened = #{flatten level};

    if (self.length == flattened.length) {
      for (var i = 0, length = self.length; i < length; i++) {
        if (self[i] !== flattened[i]) {
          break;
        }
      }

      if (i == length) {
        return nil;
      }
    }

    #{replace `flattened`};
  }

  self
end

#hash ⇒ Object 



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# File 'opal/opal/corelib/array.rb', line 1239

def hash
  %x{
    var top = ($hash_ids === undefined),
        result = ['A'],
        hash_id = self.$object_id(),
        item, i, key;

    try {
      if (top) {
        $hash_ids = Object.create(null);
      }

      // return early for recursive structures
      if ($hash_ids[hash_id]) {
        return 'self';
      }

      for (key in $hash_ids) {
        item = $hash_ids[key];
        if (#{eql?(`item`)}) {
          return 'self';
        }
      }

      $hash_ids[hash_id] = self;

      for (i = 0; i < self.length; i++) {
        item = self[i];
        result.push(item.$hash());
      }

      return result.join(',');
    } finally {
      if (top) {
        $hash_ids = undefined;
      }
    }
  }
end

#include?(member) ⇒ Boolean

Returns:



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# File 'opal/opal/corelib/array.rb', line 1279

def include?(member)
  %x{
    for (var i = 0, length = self.length; i < length; i++) {
      if (#{`self[i]` == member}) {
        return true;
      }
    }

    return false;
  }
end

#index(object = undefined, &block) ⇒ Object 



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# File 'opal/opal/corelib/array.rb', line 1291

def index(object = undefined, &block)
  %x{
    var i, length, value;

    if (object != null && block !== nil) {
      #{warn('warning: given block not used')}
    }

    if (object != null) {
      for (i = 0, length = self.length; i < length; i++) {
        if (#{`self[i]` == object}) {
          return i;
        }
      }
    }
    else if (block !== nil) {
      for (i = 0, length = self.length; i < length; i++) {
        value = block(self[i]);

        if (value !== false && value !== nil) {
          return i;
        }
      }
    }
    else {
      return #{enum_for :index};
    }

    return nil;
  }
end

#initialize_copy(other) ⇒ Object 



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# File 'opal/opal/corelib/array.rb', line 684

def initialize_copy(other)
  replace other
end

#insert(index, *objects) ⇒ Object 



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# File 'opal/opal/corelib/array.rb', line 1323

def insert(index, *objects)
  %x{
    index = $coerce_to(index, #{::Integer}, 'to_int');

    if (objects.length > 0) {
      if (index < 0) {
        index += self.length + 1;

        if (index < 0) {
          #{ ::Kernel.raise ::IndexError, "#{index} is out of bounds" };
        }
      }
      if (index > self.length) {
        for (var i = self.length; i < index; i++) {
          self.push(nil);
        }
      }

      self.splice.apply(self, [index, 0].concat(objects));
    }
  }

  self
end

#inspect ⇒ Object Also known as: to_s 



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# File 'opal/opal/corelib/array.rb', line 1350

def inspect
  %x{
    var result = [],
    id = #{__id__},
    pushed = true;
  }

  begin
    %x{
      if (inspect_stack.indexOf(id) !== -1) {
        pushed = false;
        return '[...]';
      }
      inspect_stack.push(id)

      for (var i = 0, length = self.length; i < length; i++) {
        var item = #{self[`i`]};

        result.push(#{Opal.inspect(`item`)});
      }

      return '[' + result.join(', ') + ']';
    }
    nil
  ensure
    `if (pushed) inspect_stack.pop()`
  end
end

#instance_variables ⇒ Object 



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# File 'opal/opal/corelib/array.rb', line 2433

def instance_variables
  super.reject { |ivar| `/^@\d+$/.test(#{ivar})` || ivar == '@length' }
end

#intersect?(other) ⇒ Boolean

Returns:



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# File 'opal/opal/corelib/array.rb', line 1383

def intersect?(other)
  !intersection(other).empty?
end

#intersection(*arrays) ⇒ Object 



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# File 'opal/opal/corelib/array.rb', line 1379

def intersection(*arrays)
  arrays.reduce(to_a.dup) { |a, b| a & b }
end

#join(sep = nil) ⇒ Object 



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# File 'opal/opal/corelib/array.rb', line 1387

def join(sep = nil)
  return '' if `self.length === 0`

  if `sep === nil`
    sep = $,
  end

  %x{
    var result = [];
    var i, length, item, tmp;

    for (i = 0, length = self.length; i < length; i++) {
      item = self[i];

      if ($respond_to(item, '$to_str')) {
        tmp = #{`item`.to_str};

        if (tmp !== nil) {
          result.push(#{`tmp`.to_s});

          continue;
        }
      }

      if ($respond_to(item, '$to_ary')) {
        tmp = #{`item`.to_ary};

        if (tmp === self) {
          #{::Kernel.raise ::ArgumentError};
        }

        if (tmp !== nil) {
          result.push(#{`tmp`.join(sep)});

          continue;
        }
      }

      if ($respond_to(item, '$to_s')) {
        tmp = #{`item`.to_s};

        if (tmp !== nil) {
          result.push(tmp);

          continue;
        }
      }

      #{::Kernel.raise ::NoMethodError.new("#{Opal.inspect(item)} doesn't respond to #to_str, #to_ary or #to_s", 'to_str')};
    }

    if (sep === nil) {
      return result.join('');
    }
    else {
      return result.join(#{::Opal.coerce_to!(sep, ::String, :to_str).to_s});
    }
  }
end

#keep_if(&block) ⇒ Object 



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# File 'opal/opal/corelib/array.rb', line 1447

def keep_if(&block)
  return enum_for(:keep_if) { size } unless block_given?
  %x{filterIf(self, $truthy, block)}
  self
end

#last(count = undefined) ⇒ Object 



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# File 'opal/opal/corelib/array.rb', line 1453

def last(count = undefined)
  %x{
    if (count == null) {
      return self.length === 0 ? nil : self[self.length - 1];
    }

    count = $coerce_to(count, #{::Integer}, 'to_int');

    if (count < 0) {
      #{::Kernel.raise ::ArgumentError, 'negative array size'};
    }

    if (count > self.length) {
      count = self.length;
    }

    return self.slice(self.length - count, self.length);
  }
end

#length ⇒ Object Also known as: size 



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# File 'opal/opal/corelib/array.rb', line 1473

def length
  `self.length`
end

#max(n = undefined, &block) ⇒ Object 



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# File 'opal/opal/corelib/array.rb', line 1477

def max(n = undefined, &block)
  each.max(n, &block)
end

#min(&block) ⇒ Object 



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# File 'opal/opal/corelib/array.rb', line 1481

def min(&block)
  each.min(&block)
end

#pack(*args) ⇒ Object 



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# File 'opal/opal/corelib/array/pack.rb', line 390

def pack(format)
  format = ::Opal.coerce_to!(format, ::String, :to_str).gsub(/\s/, '').delete("\000")

  %x{
    var output = '';

    var buffer = self.slice();

    function autocomplete(array, size) {
      while (array.length < size) {
        array.push(nil);
      }

      return array;
    }

    function processChunk(directive, count) {
      var chunk,
          chunkReader = readChunk[directive];

      if (chunkReader == null) {
        #{::Kernel.raise "Unsupported pack directive #{`directive`.inspect} (no chunk reader defined)"}
      }

      var chunkData = chunkReader(buffer, count);
      chunk = chunkData.chunk;
      buffer = chunkData.rest;

      var handler = handlers[directive];

      if (handler == null) {
        #{::Kernel.raise "Unsupported pack directive #{`directive`.inspect} (no handler defined)"}
      }

      return handler(chunk);
    }

    eachDirectiveAndCount(format, function(directive, count) {
      var part = processChunk(directive, count);

      if (count !== Infinity) {
        var shouldAutocomplete = autocompletion[directive]

        if (shouldAutocomplete == null) {
          #{::Kernel.raise "Unsupported pack directive #{`directive`.inspect} (no autocompletion rule defined)"}
        }

        if (shouldAutocomplete) {
          autocomplete(part, count);
        }
      }

      output = output.concat(part);
    });

    if (format.match(/^(U\*?)+$/)) {
      return output;
    }
    else {
      return Opal.enc(output, "binary");
    }
  }
end

#permutation(num = undefined, &block) ⇒ Object 



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# File 'opal/opal/corelib/array.rb', line 1498

def permutation(num = undefined, &block)
  unless block_given?
    return enum_for(:permutation, num) do
      `descending_factorial(self.length, num === undefined ? self.length : num)`
    end
  end

  %x{
    var permute, offensive, output;

    if (num === undefined) {
      num = self.length;
    }
    else {
      num = $coerce_to(num, #{::Integer}, 'to_int');
    }

    if (num < 0 || self.length < num) {
      // no permutations, yield nothing
    }
    else if (num === 0) {
      // exactly one permutation: the zero-length array
      #{ yield [] }
    }
    else if (num === 1) {
      // this is a special, easy case
      for (var i = 0; i < self.length; i++) {
        #{ yield `[self[i]]` }
      }
    }
    else {
      // this is the general case
      #{ perm = Array.new(num) };
      #{ used = Array.new(`self.length`, false) };

      permute = function(num, perm, index, used, blk) {
        self = this;
        for(var i = 0; i < self.length; i++){
          if(#{ !used[`i`] }) {
            perm[index] = i;
            if(index < num - 1) {
              used[i] = true;
              permute.call(self, num, perm, index + 1, used, blk);
              used[i] = false;
            }
            else {
              output = [];
              for (var j = 0; j < perm.length; j++) {
                output.push(self[perm[j]]);
              }
              $yield1(blk, output);
            }
          }
        }
      }

      if (#{block_given?}) {
        // offensive (both definitions) copy.
        offensive = self.slice();
        permute.call(offensive, num, perm, 0, used, block);
      }
      else {
        permute.call(self, num, perm, 0, used, block);
      }
    }
  }

  self
end

#pop(count = undefined) ⇒ Object 



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# File 'opal/opal/corelib/array.rb', line 1592

def pop(count = undefined)
  if `count === undefined`
    return if `self.length === 0`
    return `self.pop()`
  end

  count = `$coerce_to(count, #{::Integer}, 'to_int')`

  if `count < 0`
    ::Kernel.raise ::ArgumentError, 'negative array size'
  end

  return [] if `self.length === 0`

  if `count === 1`
    `[self.pop()]`
  elsif `count > self.length`
    `self.splice(0, self.length)`
  else
    `self.splice(self.length - count, self.length)`
  end
end

#product(*args, &block) ⇒ Object 



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# File 'opal/opal/corelib/array.rb', line 1615

def product(*args, &block)
  %x{
    var result = #{block_given?} ? null : [],
        n = args.length + 1,
        counters = new Array(n),
        lengths  = new Array(n),
        arrays   = new Array(n),
        i, m, subarray, len, resultlen = 1;

    arrays[0] = self;
    for (i = 1; i < n; i++) {
      arrays[i] = $coerce_to(args[i - 1], #{::Array}, 'to_ary');
    }

    for (i = 0; i < n; i++) {
      len = arrays[i].length;
      if (len === 0) {
        return result || self;
      }
      resultlen *= len;
      if (resultlen > 2147483647) {
        #{::Kernel.raise ::RangeError, 'too big to product'}
      }
      lengths[i] = len;
      counters[i] = 0;
    }

    outer_loop: for (;;) {
      subarray = [];
      for (i = 0; i < n; i++) {
        subarray.push(arrays[i][counters[i]]);
      }
      if (result) {
        result.push(subarray);
      } else {
        #{yield `subarray`}
      }
      m = n - 1;
      counters[m]++;
      while (counters[m] === lengths[m]) {
        counters[m] = 0;
        if (--m < 0) break outer_loop;
        counters[m]++;
      }
    }

    return result || self;
  }
end

#push(*objects) ⇒ Object Also known as: append 



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# File 'opal/opal/corelib/array.rb', line 1665

def push(*objects)
  %x{
    for (var i = 0, length = objects.length; i < length; i++) {
      self.push(objects[i]);
    }
  }

  self
end

#rassoc(object) ⇒ Object 



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# File 'opal/opal/corelib/array.rb', line 1675

def rassoc(object)
  %x{
    for (var i = 0, length = self.length, item; i < length; i++) {
      item = self[i];

      if (item.length && item[1] !== undefined) {
        if (#{`item[1]` == object}) {
          return item;
        }
      }
    }

    return nil;
  }
end

#reject(&block) ⇒ Object 



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# File 'opal/opal/corelib/array.rb', line 1691

def reject(&block)
  return enum_for(:reject) { size } unless block_given?

  %x{
    var result = [];

    for (var i = 0, length = self.length, value; i < length; i++) {
      value = block(self[i]);

      if (value === false || value === nil) {
        result.push(self[i]);
      }
    }
    return result;
  }
end

#reject!(&block) ⇒ Object 



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# File 'opal/opal/corelib/array.rb', line 1708

def reject!(&block)
  return enum_for(:reject!) { size } unless block_given?

  original = length
  delete_if(&block)

  unless length == original
    self
  end
end

#repeated_combination(n) ⇒ Object 



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# File 'opal/opal/corelib/array.rb', line 778

def repeated_combination(n)
  num = ::Opal.coerce_to! n, ::Integer, :to_int

  unless block_given?
    return enum_for(:repeated_combination, num) { `binomial_coefficient(self.length + num - 1, num)` }
  end

  %x{
    function iterate(max, from, buffer, self) {
      if (buffer.length == max) {
        var copy = buffer.slice();
        #{yield `copy`}
        return;
      }
      for (var i = from; i < self.length; i++) {
        buffer.push(self[i]);
        iterate(max, i, buffer, self);
        buffer.pop();
      }
    }

    if (num >= 0) {
      iterate(num, 0, [], self);
    }
  }
  self
end

#repeated_permutation(n) ⇒ Object 



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# File 'opal/opal/corelib/array.rb', line 1568

def repeated_permutation(n)
  num = ::Opal.coerce_to! n, ::Integer, :to_int
  return enum_for(:repeated_permutation, num) { num >= 0 ? size**num : 0 } unless block_given?

  %x{
    function iterate(max, buffer, self) {
      if (buffer.length == max) {
        var copy = buffer.slice();
        #{yield `copy`}
        return;
      }
      for (var i = 0; i < self.length; i++) {
        buffer.push(self[i]);
        iterate(max, buffer, self);
        buffer.pop();
      }
    }

    iterate(num, [], self.slice());
  }

  self
end

#replace(other) ⇒ Object 



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# File 'opal/opal/corelib/array.rb', line 1719

def replace(other)
  other = if ::Array === other
            other.to_a
          else
            `$coerce_to(other, #{::Array}, 'to_ary')`.to_a
          end

  %x{
    self.splice(0, self.length);
    self.push.apply(self, other);
  }

  self
end

#reverse ⇒ Object 



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# File 'opal/opal/corelib/array.rb', line 1734

def reverse
  `self.slice(0).reverse()`
end

#reverse! ⇒ Object 



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# File 'opal/opal/corelib/array.rb', line 1738

def reverse!
  `self.reverse()`
end

#reverse_each(&block) ⇒ Object 



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# File 'opal/opal/corelib/array.rb', line 1742

def reverse_each(&block)
  return enum_for(:reverse_each) { size } unless block_given?

  reverse.each(&block)
  self
end

#rindex(object = undefined, &block) ⇒ Object 



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# File 'opal/opal/corelib/array.rb', line 1749

def rindex(object = undefined, &block)
  %x{
    var i, value;

    if (object != null && block !== nil) {
      #{warn('warning: given block not used')}
    }

    if (object != null) {
      for (i = self.length - 1; i >= 0; i--) {
        if (i >= self.length) {
          break;
        }
        if (#{`self[i]` == `object`}) {
          return i;
        }
      }
    }
    else if (block !== nil) {
      for (i = self.length - 1; i >= 0; i--) {
        if (i >= self.length) {
          break;
        }

        value = block(self[i]);

        if (value !== false && value !== nil) {
          return i;
        }
      }
    }
    else if (object == null) {
      return #{enum_for :rindex};
    }

    return nil;
  }
end

#rotate(n = 1) ⇒ Object 



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# File 'opal/opal/corelib/array.rb', line 1788

def rotate(n = 1)
  %x{
    var ary, idx, firstPart, lastPart;

    n = $coerce_to(n, #{::Integer}, 'to_int')

    if (self.length === 1) {
      return self.slice();
    }
    if (self.length === 0) {
      return [];
    }

    ary = self.slice();
    idx = n % ary.length;

    firstPart = ary.slice(idx);
    lastPart = ary.slice(0, idx);
    return firstPart.concat(lastPart);
  }
end

#rotate!(cnt = 1) ⇒ Object 



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# File 'opal/opal/corelib/array.rb', line 1810

def rotate!(cnt = 1)
  %x{
    if (self.length === 0 || self.length === 1) {
      return self;
    }
    cnt = $coerce_to(cnt, #{::Integer}, 'to_int');
  }
  ary = rotate(cnt)
  replace ary
end

#sample(count = undefined, options = undefined) ⇒ Object 



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# File 'opal/opal/corelib/array.rb', line 1835

def sample(count = undefined, options = undefined)
  return at ::Kernel.rand(`self.length`) if `count === undefined`

  if `options === undefined`
    if (o = ::Opal.coerce_to? count, ::Hash, :to_hash)
      options = o
      count = nil
    else
      options = nil
      count = `$coerce_to(count, #{::Integer}, 'to_int')`
    end
  else
    count = `$coerce_to(count, #{::Integer}, 'to_int')`
    options = `$coerce_to(options, #{::Hash}, 'to_hash')`
  end

  if count && `count < 0`
    ::Kernel.raise ::ArgumentError, 'count must be greater than 0'
  end

  rng = options[:random] if options
  rng = if rng && rng.respond_to?(:rand)
          SampleRandom.new rng
        else
          ::Kernel
        end

  return `self[#{rng.rand(`self.length`)}]` unless count

  %x{

    var abandon, spin, result, i, j, k, targetIndex, oldValue;

    if (count > self.length) {
      count = self.length;
    }

    switch (count) {
      case 0:
        return [];
        break;
      case 1:
        return [self[#{rng.rand(`self.length`)}]];
        break;
      case 2:
        i = #{rng.rand(`self.length`)};
        j = #{rng.rand(`self.length`)};
        if (i === j) {
          j = i === 0 ? i + 1 : i - 1;
        }
        return [self[i], self[j]];
        break;
      default:
        if (self.length / count > 3) {
          abandon = false;
          spin = 0;

          result = #{ Array.new(count) };
          i = 1;

          result[0] = #{rng.rand(`self.length`)};
          while (i < count) {
            k = #{rng.rand(`self.length`)};
            j = 0;

            while (j < i) {
              while (k === result[j]) {
                spin++;
                if (spin > 100) {
                  abandon = true;
                  break;
                }
                k = #{rng.rand(`self.length`)};
              }
              if (abandon) { break; }

              j++;
            }

            if (abandon) { break; }

            result[i] = k;

            i++;
          }

          if (!abandon) {
            i = 0;
            while (i < count) {
              result[i] = self[result[i]];
              i++;
            }

            return result;
          }
        }

        result = self.slice();

        for (var c = 0; c < count; c++) {
          targetIndex = #{rng.rand(`self.length`)};
          oldValue = result[c];
          result[c] = result[targetIndex];
          result[targetIndex] = oldValue;
        }

        return count === self.length ? result : #{`result`[0, count]};
    }
  }
end

#select(&block) ⇒ Object Also known as: filter 



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# File 'opal/opal/corelib/array.rb', line 1946

def select(&block)
  return enum_for(:select) { size } unless block_given?

  %x{
    var result = [];

    for (var i = 0, length = self.length, item, value; i < length; i++) {
      item = self[i];

      value = $yield1(block, item);

      if ($truthy(value)) {
        result.push(item);
      }
    }

    return result;
  }
end

#select!(&block) ⇒ Object Also known as: filter! 



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# File 'opal/opal/corelib/array.rb', line 1966

def select!(&block)
  return enum_for(:select!) { size } unless block_given?

  %x{
    var original = self.length;
    #{ keep_if(&block) };
    return self.length === original ? nil : self;
  }
end

#shift(count = undefined) ⇒ Object 



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# File 'opal/opal/corelib/array.rb', line 1976

def shift(count = undefined)
  if `count === undefined`
    return if `self.length === 0`
    return `shiftNoArg(self)`
  end

  count = `$coerce_to(count, #{::Integer}, 'to_int')`

  if `count < 0`
    ::Kernel.raise ::ArgumentError, 'negative array size'
  end

  return [] if `self.length === 0`

  `self.splice(0, count)`
end

#shuffle(rng = undefined) ⇒ Object 



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# File 'opal/opal/corelib/array.rb', line 1993

def shuffle(rng = undefined)
  dup.to_a.shuffle!(rng)
end

#shuffle!(rng = undefined) ⇒ Object 



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# File 'opal/opal/corelib/array.rb', line 1997

def shuffle!(rng = undefined)
  %x{
    var randgen, i = self.length, j, tmp;

    if (rng !== undefined) {
      rng = #{::Opal.coerce_to?(rng, ::Hash, :to_hash)};

      if (rng !== nil) {
        rng = #{rng[:random]};

        if (rng !== nil && #{rng.respond_to?(:rand)}) {
          randgen = rng;
        }
      }
    }

    while (i) {
      if (randgen) {
        j = randgen.$rand(i).$to_int();

        if (j < 0) {
          #{::Kernel.raise ::RangeError, "random number too small #{`j`}"}
        }

        if (j >= i) {
          #{::Kernel.raise ::RangeError, "random number too big #{`j`}"}
        }
      }
      else {
        j = #{rand(`i`)};
      }

      tmp = self[--i];
      self[i] = self[j];
      self[j] = tmp;
    }

    return self;
  }
end

#slice!(index, length = undefined) ⇒ Object 



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# File 'opal/opal/corelib/array.rb', line 2038

def slice!(index, length = undefined)
  result = nil

  if `length === undefined`
    if ::Range === index
      range = index
      result = self[range]

      range_start = `range.begin === nil ? 0 : $coerce_to(range.begin, #{::Integer}, 'to_int')`
      range_end = `range.end === nil ? -1 : $coerce_to(range.end, #{::Integer}, 'to_int')`

      %x{
        if (range_start < 0) {
          range_start += self.length;
        }

        if (range_end < 0) {
          range_end += self.length;
        } else if (range_end >= self.length) {
          range_end = self.length - 1;
          if (range.excl) {
            range_end += 1;
          }
        }

        var range_length = range_end - range_start;
        if (range.excl && range.end !== nil) {
          range_end -= 1;
        } else {
          range_length += 1;
        }

        if (range_start < self.length && range_start >= 0 && range_end < self.length && range_end >= 0 && range_length > 0) {
          self.splice(range_start, range_length);
        }
      }
    else
      start = `$coerce_to(index, #{::Integer}, 'to_int')`
      %x{
        if (start < 0) {
          start += self.length;
        }

        if (start < 0 || start >= self.length) {
          return nil;
        }

        result = self[start];

        if (start === 0) {
          self.shift();
        } else {
          self.splice(start, 1);
        }
      }
    end
  else
    start = `$coerce_to(index, #{::Integer}, 'to_int')`
    length = `$coerce_to(length, #{::Integer}, 'to_int')`

    %x{
      if (length < 0) {
        return nil;
      }

      var end = start + length;

      result = #{self[start, length]};

      if (start < 0) {
        start += self.length;
      }

      if (start + length > self.length) {
        length = self.length - start;
      }

      if (start < self.length && start >= 0) {
        self.splice(start, length);
      }
    }
  end
  result
end

#sort(&block) ⇒ Object 



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# File 'opal/opal/corelib/array.rb', line 2123

def sort(&block)
  return self unless `self.length > 1`

  %x{
    if (block === nil) {
      block = function(a, b) {
        return #{`a` <=> `b`};
      };
    }

    return self.slice().sort(function(x, y) {
      var ret = block(x, y);

      if (ret === nil) {
        #{::Kernel.raise ::ArgumentError, "comparison of #{`x`.inspect} with #{`y`.inspect} failed"};
      }

      return #{`ret` > 0} ? 1 : (#{`ret` < 0} ? -1 : 0);
    });
  }
end

#sort!(&block) ⇒ Object 



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# File 'opal/opal/corelib/array.rb', line 2145

def sort!(&block)
  %x{
    var result;

    if (#{block_given?}) {
      result = #{`self.slice()`.sort(&block)};
    }
    else {
      result = #{`self.slice()`.sort};
    }

    self.length = 0;
    for(var i = 0, length = result.length; i < length; i++) {
      self.push(result[i]);
    }

    return self;
  }
end

#sort_by!(&block) ⇒ Object 



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# File 'opal/opal/corelib/array.rb', line 2165

def sort_by!(&block)
  return enum_for(:sort_by!) { size } unless block_given?

  replace sort_by(&block)
end

#take(count) ⇒ Object 



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# File 'opal/opal/corelib/array.rb', line 2171

def take(count)
  %x{
    if (count < 0) {
      #{::Kernel.raise ::ArgumentError};
    }

    return self.slice(0, count);
  }
end

#take_while(&block) ⇒ Object 



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# File 'opal/opal/corelib/array.rb', line 2181

def take_while(&block)
  %x{
    var result = [];

    for (var i = 0, length = self.length, item, value; i < length; i++) {
      item = self[i];

      value = block(item);

      if (value === false || value === nil) {
        return result;
      }

      result.push(item);
    }

    return result;
  }
end

#to_a ⇒ Object 



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# File 'opal/opal/corelib/array.rb', line 2201

def to_a
  %x{
    if (self.$$class === Opal.Array) {
      return self;
    }
    else {
      return Opal.Array.$new(self);
    }
  }
end

#to_ary ⇒ Object 



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# File 'opal/opal/corelib/array.rb', line 2212

def to_ary
  self
end

#to_h(&block) ⇒ Object 



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# File 'opal/opal/corelib/array.rb', line 2216

def to_h(&block)
  array = self
  array = array.map(&block) if block_given?

  %x{
    var i, len = array.length, ary, key, val, hash = #{{}};

    for (i = 0; i < len; i++) {
      ary = #{::Opal.coerce_to?(`array[i]`, ::Array, :to_ary)};
      if (!ary.$$is_array) {
        #{::Kernel.raise ::TypeError, "wrong element type #{`ary`.class} at #{`i`} (expected array)"}
      }
      if (ary.length !== 2) {
        #{::Kernel.raise ::ArgumentError, "wrong array length at #{`i`} (expected 2, was #{`ary`.length})"}
      }
      key = ary[0];
      val = ary[1];
      $hash_put(hash, key, val);
    }

    return hash;
  }
end

#transpose ⇒ Object 



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# File 'opal/opal/corelib/array.rb', line 2240

def transpose
  return [] if empty?

  result = []
  max    = nil

  each do |row|
    row = if ::Array === row
            row.to_a
          else
            `$coerce_to(row, #{::Array}, 'to_ary')`.to_a
          end

    max ||= `row.length`

    if `row.length` != max
      ::Kernel.raise ::IndexError, "element size differs (#{`row.length`} should be #{max})"
    end

    `row.length`.times do |i|
      entry = (result[i] ||= [])
      entry << row.at(i)
    end
  end

  result
end

#union(*arrays) ⇒ Object 



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# File 'opal/opal/corelib/array.rb', line 2268

def union(*arrays)
  arrays.reduce(uniq) { |a, b| a | b }
end

#uniq(&block) ⇒ Object 



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# File 'opal/opal/corelib/array.rb', line 2272

def uniq(&block)
  %x{
    var hash = #{{}}, i, length, item, key;

    if (block === nil) {
      for (i = 0, length = self.length; i < length; i++) {
        item = self[i];
        if ($hash_get(hash, item) === undefined) {
          $hash_put(hash, item, item);
        }
      }
    }
    else {
      for (i = 0, length = self.length; i < length; i++) {
        item = self[i];
        key = $yield1(block, item);
        if ($hash_get(hash, key) === undefined) {
          $hash_put(hash, key, item);
        }
      }
    }

    return #{`hash`.values};
  }
end

#uniq!(&block) ⇒ Object 



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# File 'opal/opal/corelib/array.rb', line 2298

def uniq!(&block)
  %x{
    var original_length = self.length, hash = #{{}}, i, length, item, key;

    for (i = 0, length = original_length; i < length; i++) {
      item = self[i];
      key = (block === nil ? item : $yield1(block, item));

      if ($hash_get(hash, key) === undefined) {
        $hash_put(hash, key, item);
        continue;
      }

      self.splice(i, 1);
      length--;
      i--;
    }

    return self.length === original_length ? nil : self;
  }
end

#unshift(*objects) ⇒ Object Also known as: prepend 



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# File 'opal/opal/corelib/array.rb', line 2320

def unshift(*objects)
  %x{
    var selfLength = self.length
    var objectsLength = objects.length
    if (objectsLength == 0) return self;
    var index = selfLength - objectsLength
    for (var i = 0; i < objectsLength; i++) {
      self.push(self[index + i])
    }
    var len = selfLength - 1
    while (len - objectsLength >= 0) {
      self[len] = self[len - objectsLength]
      len--
    }
    for (var j = 0; j < objectsLength; j++) {
      self[j] = objects[j]
    }
    return self;
  }
end

#values_at(*args) ⇒ Object 



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# File 'opal/opal/corelib/array.rb', line 2341

def values_at(*args)
  out = []

  args.each do |elem|
    if elem.is_a? ::Range
      finish = `#{elem.end} === nil ? -1 : $coerce_to(#{elem.end}, #{::Integer}, 'to_int')`
      start = `#{elem.begin} === nil ? 0 : $coerce_to(#{elem.begin}, #{::Integer}, 'to_int')`

      %x{
        if (start < 0) {
          start = start + self.length;
          #{next};
        }
      }

      %x{
        if (finish < 0) {
          finish = finish + self.length;
        }
        if (#{elem.exclude_end?} && #{elem.end} !== nil) {
          finish--;
        }
        if (finish < start) {
          #{next};
        }
      }

      start.upto(finish) { |i| out << at(i) }
    else
      i = `$coerce_to(elem, #{::Integer}, 'to_int')`
      out << at(i)
    end
  end

  out
end

#zip(*others, &block) ⇒ Object 



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# File 'opal/opal/corelib/array.rb', line 2378

def zip(*others, &block)
  %x{
    var result = [], size = self.length, part, o, i, j, jj;

    for (j = 0, jj = others.length; j < jj; j++) {
      o = others[j];
      if (o.$$is_array) {
        continue;
      }
      if (o.$$is_range || o.$$is_enumerator) {
        others[j] = o.$take(size);
        continue;
      }
      others[j] = #{(
        ::Opal.coerce_to?(`o`, ::Array, :to_ary) ||
        ::Opal.coerce_to!(`o`, ::Enumerator, :to_enum, :each)
      ).to_a};
    }

    for (i = 0; i < size; i++) {
      part = [self[i]];

      for (j = 0, jj = others.length; j < jj; j++) {
        o = others[j][i];

        if (o == null) {
          o = nil;
        }

        part[j + 1] = o;
      }

      result[i] = part;
    }

    if (block !== nil) {
      for (i = 0; i < size; i++) {
        Opal.yield1(block, result[i]);
      }

      return nil;
    }

    return result;
  }
end

#|(other) ⇒ Object 



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# File 'opal/opal/corelib/array.rb', line 160

def |(other)
  other = if ::Array === other
            other.to_a
          else
            `$coerce_to(other, #{::Array}, 'to_ary')`.to_a
          end

  %x{
    var hash = #{{}}, i, length, item;

    for (i = 0, length = self.length; i < length; i++) {
      $hash_put(hash, self[i], true);
    }

    for (i = 0, length = other.length; i < length; i++) {
      $hash_put(hash, other[i], true);
    }

    return hash.$keys();
  }
end