Module: Enumerable

Included in:
Array, Enumerator, Enumerator::Generator, Hash, Range, Struct
Defined in:
opal/opal/corelib/enumerable.rb

Instance Method Summary collapse

Instance Method Details

#all?(&block) ⇒ Boolean

Returns:



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# File 'opal/opal/corelib/enumerable.rb', line 2

def all?(&block)
  if block_given?

    each do |*value|
      unless yield(*value)
        return false
      end
    end

  else

    each do |*value|
      unless Opal.destructure(value)
        return false
      end
    end

  end

  true
end

#any?(&block) ⇒ Boolean

Returns:



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# File 'opal/opal/corelib/enumerable.rb', line 24

def any?(&block)
  if block_given?

    each do |*value|
      if yield(*value)
        return true
      end
    end

  else

    each do |*value|
      if Opal.destructure(value)
        return true
      end
    end

  end

  false
end

#chunk(&block) ⇒ Object 



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# File 'opal/opal/corelib/enumerable.rb', line 46

def chunk(&block)
  return to_enum(:chunk) { self.enumerator_size } unless block_given?

  ::Enumerator.new do |yielder|
    %x{
      var previous = nil, accumulate = [];

      function releaseAccumulate() {
        if (accumulate.length > 0) {
          #{yielder.yield(`previous`, `accumulate`)}
        }
      }

      self.$each.$$p = function(value) {
        var key = Opal.yield1(block, value);

        if (key === nil) {
          releaseAccumulate();
          accumulate = [];
          previous = nil;
        } else {
          if (previous === nil || previous === key) {
            accumulate.push(value);
          } else {
            releaseAccumulate();
            accumulate = [value];
          }

          previous = key;
        }
      }

      self.$each();

      releaseAccumulate();
    }
  end
end

#chunk_while(&block) ⇒ Object

Raises:



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# File 'opal/opal/corelib/enumerable.rb', line 85

def chunk_while(&block)
  raise ArgumentError, "no block given" unless block_given?

  slice_when { |before, after| !(yield before, after) }
end

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



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# File 'opal/opal/corelib/enumerable.rb', line 91

def collect(&block)
  return enum_for(:collect){self.enumerator_size} unless block_given?

  %x{
    var result = [];

    self.$each.$$p = function() {
      var value = Opal.yieldX(block, arguments);

      result.push(value);
    };

    self.$each();

    return result;
  }
end

#collect_concat(&block) ⇒ Object Also known as: flat_map 



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# File 'opal/opal/corelib/enumerable.rb', line 109

def collect_concat(&block)
  return enum_for(:collect_concat){self.enumerator_size} unless block_given?
  map { |item| yield item }.flatten(1)
end

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



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# File 'opal/opal/corelib/enumerable.rb', line 114

def count(object = undefined, &block)
  result = 0

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

  if `object != null`
    block = proc do |*args|
      Opal.destructure(args) == object
    end
  elsif block.nil?
    block = proc { true }
  end

  each do |*args|
    `result++` if `Opal.yieldX(block, args)`
  end

  result
end

#cycle(n = nil, &block) ⇒ Object 



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# File 'opal/opal/corelib/enumerable.rb', line 138

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

  unless n.nil?
    n = Opal.coerce_to! n, Integer, :to_int

    return if `n <= 0`
  end

  %x{
    var result,
        all = [], i, length, value;

    self.$each.$$p = function() {
      var param = #{Opal.destructure(`arguments`)},
          value = Opal.yield1(block, param);

      all.push(param);
    }

    self.$each();

    if (result !== undefined) {
      return result;
    }

    if (all.length === 0) {
      return nil;
    }

    if (n === nil) {
      while (true) {
        for (i = 0, length = all.length; i < length; i++) {
          value = Opal.yield1(block, all[i]);
        }
      }
    }
    else {
      while (n > 1) {
        for (i = 0, length = all.length; i < length; i++) {
          value = Opal.yield1(block, all[i]);
        }

        n--;
      }
    }
  }
end

#detect(ifnone = undefined, &block) ⇒ Object Also known as: find 



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# File 'opal/opal/corelib/enumerable.rb', line 194

def detect(ifnone = undefined, &block)
  return enum_for :detect, ifnone unless block_given?

  each do |*args|
    value = Opal.destructure(args)
    if yield(value)
      return value
    end
  end

  %x{
    if (ifnone !== undefined) {
      if (typeof(ifnone) === 'function') {
        return ifnone();
      } else {
        return ifnone;
      }
    }
  }

  nil
end

#drop(number) ⇒ Object 



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# File 'opal/opal/corelib/enumerable.rb', line 217

def drop(number)
  number = Opal.coerce_to number, Integer, :to_int

  if `number < 0`
    raise ArgumentError, "attempt to drop negative size"
  end

  %x{
    var result  = [],
        current = 0;

    self.$each.$$p = function() {
      if (number <= current) {
        result.push(#{Opal.destructure(`arguments`)});
      }

      current++;
    };

    self.$each()

    return result;
  }
end

#drop_while(&block) ⇒ Object 



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# File 'opal/opal/corelib/enumerable.rb', line 242

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

  %x{
    var result   = [],
        dropping = true;

    self.$each.$$p = function() {
      var param = #{Opal.destructure(`arguments`)};

      if (dropping) {
        var value = Opal.yield1(block, param);

        if (#{Opal.falsy?(`value`)}) {
          dropping = false;
          result.push(param);
        }
      }
      else {
        result.push(param);
      }
    };

    self.$each();

    return result;
  }
end

#each_cons(n, &block) ⇒ Object 



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# File 'opal/opal/corelib/enumerable.rb', line 271

def each_cons(n, &block)
  if `arguments.length != 1`
    raise ArgumentError, "wrong number of arguments (#{`arguments.length`} for 1)"
  end

  n = Opal.try_convert n, Integer, :to_int

  if `n <= 0`
    raise ArgumentError, 'invalid size'
  end

  unless block_given?
    return enum_for(:each_cons, n) {
      enum_size = self.enumerator_size
      if enum_size.nil?
        nil
      elsif enum_size == 0 || enum_size < n
        0
      else
        enum_size - n + 1
      end
    }
  end

  %x{
    var buffer = [], result = nil;

    self.$each.$$p = function() {
      var element = #{Opal.destructure(`arguments`)};
      buffer.push(element);
      if (buffer.length > n) {
        buffer.shift();
      }
      if (buffer.length == n) {
        Opal.yield1(block, buffer.slice(0, n));
      }
    }

    self.$each();

    return result;
  }
end

#each_entry(*data, &block) ⇒ Object 



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# File 'opal/opal/corelib/enumerable.rb', line 315

def each_entry(*data, &block)
  unless block_given?
    return to_enum(:each_entry, *data) { enumerator_size }
  end

  %x{
    self.$each.$$p = function() {
      var item = #{Opal.destructure(`arguments`)};

      Opal.yield1(block, item);
    }

    self.$each.apply(self, data);

    return self;
  }
end

#each_slice(n, &block) ⇒ Object 



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# File 'opal/opal/corelib/enumerable.rb', line 333

def each_slice(n, &block)
  n = Opal.coerce_to n, Integer, :to_int

  if `n <= 0`
    raise ArgumentError, 'invalid slice size'
  end

  return enum_for(:each_slice, n){respond_to?(:size) ? (size / n).ceil : nil} unless block_given?

  %x{
    var result,
        slice = []

    self.$each.$$p = function() {
      var param = #{Opal.destructure(`arguments`)};

      slice.push(param);

      if (slice.length === n) {
        Opal.yield1(block, slice);
        slice = [];
      }
    };

    self.$each();

    if (result !== undefined) {
      return result;
    }

    // our "last" group, if smaller than n then won't have been yielded
    if (slice.length > 0) {
      Opal.yield1(block, slice);
    }
  }

  nil
end

#each_with_index(*args, &block) ⇒ Object 



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# File 'opal/opal/corelib/enumerable.rb', line 372

def each_with_index(*args, &block)
  return enum_for(:each_with_index, *args){self.enumerator_size} unless block_given?

  %x{
    var result,
        index = 0;

    self.$each.$$p = function() {
      var param = #{Opal.destructure(`arguments`)};

      block(param, index);

      index++;
    };

    self.$each.apply(self, args);

    if (result !== undefined) {
      return result;
    }
  }

  self
end

#each_with_object(object, &block) ⇒ Object 



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# File 'opal/opal/corelib/enumerable.rb', line 397

def each_with_object(object, &block)
  return enum_for(:each_with_object, object){self.enumerator_size} unless block_given?

  %x{
    var result;

    self.$each.$$p = function() {
      var param = #{Opal.destructure(`arguments`)};

      block(param, object);
    };

    self.$each();

    if (result !== undefined) {
      return result;
    }
  }

  object
end

#entries(*args) ⇒ Object Also known as: to_a 



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# File 'opal/opal/corelib/enumerable.rb', line 419

def entries(*args)
  %x{
    var result = [];

    self.$each.$$p = function() {
      result.push(#{Opal.destructure(`arguments`)});
    };

    self.$each.apply(self, args);

    return result;
  }
end

#enumerator_size ⇒ Object 



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# File 'opal/opal/corelib/enumerable.rb', line 674

def enumerator_size
  respond_to?(:size) ? size : nil
end

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



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# File 'opal/opal/corelib/enumerable.rb', line 435

def find_all(&block)
  return enum_for(:find_all){self.enumerator_size} unless block_given?

  %x{
    var result = [];

    self.$each.$$p = function() {
      var param = #{Opal.destructure(`arguments`)},
          value = Opal.yield1(block, param);

      if (#{Opal.truthy?(`value`)}) {
        result.push(param);
      }
    };

    self.$each();

    return result;
  }
end

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



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# File 'opal/opal/corelib/enumerable.rb', line 456

def find_index(object = undefined, &block)
  return enum_for :find_index if `object === undefined && block === nil`

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

  index = 0

  if `object != null`
    each do |*value|
      if Opal.destructure(value) == object
        return index
      end

      `index += 1`
    end
  else
    each do |*value|
      if yield(*value)
        return index
      end

      `index += 1`
    end
  end

  nil
end

#first(number = undefined) ⇒ Object 



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# File 'opal/opal/corelib/enumerable.rb', line 488

def first(number = undefined)
  if `number === undefined`
    each do |value|
      return value
    end
  else
    result = []
    number = Opal.coerce_to number, Integer, :to_int

    if `number < 0`
      raise ArgumentError, 'attempt to take negative size'
    end

    if `number == 0`
      return []
    end

    current = 0

    each do |*args|
      `result.push(#{Opal.destructure(args)})`

      if `number <= ++current`
        return result
      end
    end

    result
  end
end

#grep(pattern, &block) ⇒ Object 



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# File 'opal/opal/corelib/enumerable.rb', line 521

def grep(pattern, &block)
  %x{
    var result = [];

    if (block !== nil) {
      self.$each.$$p = function() {
        var param = #{Opal.destructure(`arguments`)},
            value = #{pattern === `param`};

        if (#{Opal.truthy?(`value`)}) {
          value = Opal.yield1(block, param);

          result.push(value);
        }
      };
    }
    else {
      self.$each.$$p = function() {
        var param = #{Opal.destructure(`arguments`)},
            value = #{pattern === `param`};

        if (#{Opal.truthy?(`value`)}) {
          result.push(param);
        }
      };
    }

    self.$each();

    return result;
  }
end

#grep_v(pattern, &block) ⇒ Object 



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# File 'opal/opal/corelib/enumerable.rb', line 554

def grep_v(pattern, &block)
  %x{
    var result = [];

    if (block !== nil) {
      self.$each.$$p = function() {
        var param = #{Opal.destructure(`arguments`)},
            value = #{pattern === `param`};

        if (#{Opal.falsy?(`value`)}) {
          value = Opal.yield1(block, param);

          result.push(value);
        }
      };
    }
    else {
      self.$each.$$p = function() {
        var param = #{Opal.destructure(`arguments`)},
            value = #{pattern === `param`};

        if (#{Opal.falsy?(`value`)}) {
          result.push(param);
        }
      };
    }

    self.$each();

    return result;
  }
end

#group_by(&block) ⇒ Object 



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# File 'opal/opal/corelib/enumerable.rb', line 587

def group_by(&block)
  return enum_for(:group_by){self.enumerator_size} unless block_given?

  hash = Hash.new

  %x{
    var result;

    self.$each.$$p = function() {
      var param = #{Opal.destructure(`arguments`)},
          value = Opal.yield1(block, param);

      #{(hash[`value`] ||= []) << `param`};
    }

    self.$each();

    if (result !== undefined) {
      return result;
    }
  }

  hash
end

#include?(obj) ⇒ Boolean Also known as: member?

Returns:



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# File 'opal/opal/corelib/enumerable.rb', line 612

def include?(obj)
  each do |*args|
    if Opal.destructure(args) == obj
      return true
    end
  end

  false
end

#inject(object = undefined, sym = undefined, &block) ⇒ Object Also known as: reduce 



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# File 'opal/opal/corelib/enumerable.rb', line 622

def inject(object = undefined, sym = undefined, &block)
  %x{
    var result = object;

    if (block !== nil && sym === undefined) {
      self.$each.$$p = function() {
        var value = #{Opal.destructure(`arguments`)};

        if (result === undefined) {
          result = value;
          return;
        }

        value = Opal.yieldX(block, [result, value]);

        result = value;
      };
    }
    else {
      if (sym === undefined) {
        if (!#{Symbol === object}) {
          #{raise TypeError, "#{object.inspect} is not a Symbol"};
        }

        sym    = object;
        result = undefined;
      }

      self.$each.$$p = function() {
        var value = #{Opal.destructure(`arguments`)};

        if (result === undefined) {
          result = value;
          return;
        }

        result = #{`result`.__send__ sym, `value`};
      };
    }

    self.$each();

    return result == undefined ? nil : result;
  }
end

#lazy ⇒ Object 



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# File 'opal/opal/corelib/enumerable.rb', line 668

def lazy
  Enumerator::Lazy.new(self, enumerator_size) {|enum, *args|
    enum.yield(*args)
  }
end

#max(n = undefined, &block) ⇒ Object 



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# File 'opal/opal/corelib/enumerable.rb', line 680

def max(n = undefined, &block)
  %x{
    if (n === undefined || n === nil) {
      var result, value;

      self.$each.$$p = function() {
        var item = #{Opal.destructure(`arguments`)};

        if (result === undefined) {
          result = item;
          return;
        }

        if (block !== nil) {
          value = Opal.yieldX(block, [item, result]);
        } else {
          value = #{`item` <=> `result`};
        }

        if (value === nil) {
          #{raise ArgumentError, "comparison failed"};
        }

        if (value > 0) {
          result = item;
        }
      }

      self.$each();

      if (result === undefined) {
        return nil;
      } else {
        return result;
      }
    }
  }

  n = Opal.coerce_to(n, Integer, :to_int)

  sort(&block).reverse.first(n)
end

#max_by(&block) ⇒ Object 



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# File 'opal/opal/corelib/enumerable.rb', line 723

def max_by(&block)
  return enum_for(:max_by){self.enumerator_size} unless block

  %x{
    var result,
        by;

    self.$each.$$p = function() {
      var param = #{Opal.destructure(`arguments`)},
          value = Opal.yield1(block, param);

      if (result === undefined) {
        result = param;
        by     = value;
        return;
      }

      if (#{`value` <=> `by`} > 0) {
        result = param
        by     = value;
      }
    };

    self.$each();

    return result === undefined ? nil : result;
  }
end

#min(&block) ⇒ Object 



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# File 'opal/opal/corelib/enumerable.rb', line 754

def min(&block)
  %x{
    var result;

    if (block !== nil) {
      self.$each.$$p = function() {
        var param = #{Opal.destructure(`arguments`)};

        if (result === undefined) {
          result = param;
          return;
        }

        var value = block(param, result);

        if (value === nil) {
          #{raise ArgumentError, "comparison failed"};
        }

        if (value < 0) {
          result = param;
        }
      };
    }
    else {
      self.$each.$$p = function() {
        var param = #{Opal.destructure(`arguments`)};

        if (result === undefined) {
          result = param;
          return;
        }

        if (#{Opal.compare(`param`, `result`)} < 0) {
          result = param;
        }
      };
    }

    self.$each();

    return result === undefined ? nil : result;
  }
end

#min_by(&block) ⇒ Object 



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# File 'opal/opal/corelib/enumerable.rb', line 799

def min_by(&block)
  return enum_for(:min_by){self.enumerator_size} unless block

  %x{
    var result,
        by;

    self.$each.$$p = function() {
      var param = #{Opal.destructure(`arguments`)},
          value = Opal.yield1(block, param);

      if (result === undefined) {
        result = param;
        by     = value;
        return;
      }

      if (#{`value` <=> `by`} < 0) {
        result = param
        by     = value;
      }
    };

    self.$each();

    return result === undefined ? nil : result;
  }
end

#minmax(&block) ⇒ Object 



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# File 'opal/opal/corelib/enumerable.rb', line 828

def minmax(&block)
  block ||= proc { |a,b| a <=> b }

  %x{
    var min = nil, max = nil, first_time = true;

    self.$each.$$p = function() {
      var element = #{Opal.destructure(`arguments`)};
      if (first_time) {
        min = max = element;
        first_time = false;
      } else {
        var min_cmp = #{block.call(`min`, `element`)};

        if (min_cmp === nil) {
          #{raise ArgumentError, 'comparison failed'}
        } else if (min_cmp > 0) {
          min = element;
        }

        var max_cmp = #{block.call(`max`, `element`)};

        if (max_cmp === nil) {
          #{raise ArgumentError, 'comparison failed'}
        } else if (max_cmp < 0) {
          max = element;
        }
      }
    }

    self.$each();

    return [min, max];
  }
end

#minmax_by(&block) ⇒ Object

Raises:



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# File 'opal/opal/corelib/enumerable.rb', line 864

def minmax_by(&block)
  raise NotImplementedError
end

#none?(&block) ⇒ Boolean

Returns:



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# File 'opal/opal/corelib/enumerable.rb', line 868

def none?(&block)
  if block_given?

    each do |*value|
      if yield(*value)
        return false
      end
    end

  else

    each do |*value|
      if Opal.destructure(value)
        return false
      end
    end

  end

  true
end

#one?(&block) ⇒ Boolean

Returns:



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# File 'opal/opal/corelib/enumerable.rb', line 890

def one?(&block)
  count = 0

  if block_given?

    each do |*value|
      if yield(*value)
        count += 1

        return false if count > 1
      end
    end

  else

    each do |*value|
      if Opal.destructure(value)
        count += 1

        return false if count > 1
      end
    end

  end

  count == 1
end

#partition(&block) ⇒ Object 



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# File 'opal/opal/corelib/enumerable.rb', line 918

def partition(&block)
  return enum_for(:partition){self.enumerator_size} unless block_given?

  %x{
    var truthy = [], falsy = [], result;

    self.$each.$$p = function() {
      var param = #{Opal.destructure(`arguments`)},
          value = Opal.yield1(block, param);

      if (#{Opal.truthy?(`value`)}) {
        truthy.push(param);
      }
      else {
        falsy.push(param);
      }
    };

    self.$each();

    return [truthy, falsy];
  }
end

#reject(&block) ⇒ Object 



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

def reject(&block)
  return enum_for(:reject){self.enumerator_size} unless block_given?

  %x{
    var result = [];

    self.$each.$$p = function() {
      var param = #{Opal.destructure(`arguments`)},
          value = Opal.yield1(block, param);

      if (#{Opal.falsy?(`value`)}) {
        result.push(param);
      }
    };

    self.$each();

    return result;
  }
end

#reverse_each(&block) ⇒ Object 



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# File 'opal/opal/corelib/enumerable.rb', line 965

def reverse_each(&block)
  return enum_for(:reverse_each){self.enumerator_size} unless block_given?

  %x{
    var result = [];

    self.$each.$$p = function() {
      result.push(arguments);
    };

    self.$each();

    for (var i = result.length - 1; i >= 0; i--) {
      Opal.yieldX(block, result[i]);
    }

    return result;
  }
end

#slice_after(pattern = undefined, &block) ⇒ Object 



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# File 'opal/opal/corelib/enumerable.rb', line 1051

def slice_after(pattern = undefined, &block)
  if `pattern === undefined && block === nil`
    raise ArgumentError, "both pattern and block are given"
  end

  if `pattern !== undefined && block !== nil || arguments.length > 1`
    raise ArgumentError, "wrong number of arguments (#{`arguments.length`} expected 1)"
  end

  if `pattern !== undefined`
    block = proc { |e| pattern === e }
  end

  Enumerator.new do |yielder|
    %x{
      var accumulate;

      self.$each.$$p = function() {
        var element = #{Opal.destructure(`arguments`)},
            end_chunk = Opal.yield1(block, element);

        if (accumulate == null) {
          accumulate = [];
        }

        if (#{Opal.truthy?(`end_chunk`)}) {
          accumulate.push(element);
          #{yielder.yield(`accumulate`)};
          accumulate = null;
        } else {
          accumulate.push(element)
        }
      }

      self.$each();

      if (accumulate != null) {
        #{yielder.yield(`accumulate`)};
      }
    }
  end
end

#slice_before(pattern = undefined, &block) ⇒ Object 



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# File 'opal/opal/corelib/enumerable.rb', line 987

def slice_before(pattern = undefined, &block)
  if `pattern === undefined && block === nil`
    raise ArgumentError, "both pattern and block are given"
  end

  if `pattern !== undefined && block !== nil || arguments.length > 1`
    raise ArgumentError, "wrong number of arguments (#{`arguments.length`} expected 1)"
  end

  Enumerator.new {|e|
    %x{
      var slice = [];

      if (block !== nil) {
        if (pattern === undefined) {
          self.$each.$$p = function() {
            var param = #{Opal.destructure(`arguments`)},
                value = Opal.yield1(block, param);

            if (#{Opal.truthy?(`value`)} && slice.length > 0) {
              #{e << `slice`};
              slice = [];
            }

            slice.push(param);
          };
        }
        else {
          self.$each.$$p = function() {
            var param = #{Opal.destructure(`arguments`)},
                value = block(param, #{pattern.dup});

            if (#{Opal.truthy?(`value`)} && slice.length > 0) {
              #{e << `slice`};
              slice = [];
            }

            slice.push(param);
          };
        }
      }
      else {
        self.$each.$$p = function() {
          var param = #{Opal.destructure(`arguments`)},
              value = #{pattern === `param`};

          if (#{Opal.truthy?(`value`)} && slice.length > 0) {
            #{e << `slice`};
            slice = [];
          }

          slice.push(param);
        };
      }

      self.$each();

      if (slice.length > 0) {
        #{e << `slice`};
      }
    }
  }
end

#slice_when(&block) ⇒ Object

Raises:



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# File 'opal/opal/corelib/enumerable.rb', line 1094

def slice_when(&block)
  raise ArgumentError, "wrong number of arguments (0 for 1)" unless block_given?

  Enumerator.new do |yielder|
    %x{
      var slice = nil, last_after = nil;

      self.$each_cons.$$p = function() {
        var params = #{Opal.destructure(`arguments`)},
            before = params[0],
            after = params[1],
            match = Opal.yieldX(block, [before, after]);

        last_after = after;

        if (slice === nil) {
          slice = [];
        }

        if (#{Opal.truthy?(`match`)}) {
          slice.push(before);
          #{yielder.yield(`slice`)};
          slice = [];
        } else {
          slice.push(before);
        }
      }

      self.$each_cons(2);

      if (slice !== nil) {
        slice.push(last_after);
        #{yielder.yield(`slice`)};
      }
    }
  end
end

#sort(&block) ⇒ Object 



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# File 'opal/opal/corelib/enumerable.rb', line 1132

def sort(&block)
  ary = to_a
  block = -> a,b {a <=> b} unless block_given?
  return ary.sort(&block)
end

#sort_by(&block) ⇒ Object 



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# File 'opal/opal/corelib/enumerable.rb', line 1138

def sort_by(&block)
  return enum_for(:sort_by){self.enumerator_size} unless block_given?

  dup = map {
    arg = Opal.destructure(`arguments`)
    [yield(arg), arg]
  }
  dup.sort! { |a, b| `a[0]` <=> `b[0]` }
  dup.map! { |i| `i[1]` }
end

#sum(initial = 0, &block) ⇒ Object 



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# File 'opal/opal/corelib/enumerable.rb', line 1149

def sum(initial = 0, &block)
  result = initial

  each do |*args|
    if block_given?
      item = block.call(*args)
    else
      item = Opal.destructure(args)
    end
    result += item
  end

  result
end

#take(num) ⇒ Object 



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# File 'opal/opal/corelib/enumerable.rb', line 1164

def take(num)
  first(num)
end

#take_while(&block) ⇒ Object 



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# File 'opal/opal/corelib/enumerable.rb', line 1168

def take_while(&block)
  return enum_for :take_while unless block

  result = []

  each do |*args|
    value = Opal.destructure(args)

    unless yield(value)
      return result
    end

    `result.push(value)`
  end
end

#uniq(&block) ⇒ Object 



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# File 'opal/opal/corelib/enumerable.rb', line 1184

def uniq(&block)
  hash = {}

  each do |*args|
    value = Opal.destructure(args)

    produced = if block_given?
      block.call(value)
    else
      value
    end

    unless hash.has_key?(produced)
      hash[produced] = value
    end
  end

  hash.values
end

#zip(*others, &block) ⇒ Object 



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# File 'opal/opal/corelib/enumerable.rb', line 1206

def zip(*others, &block)
  to_a.zip(*others)
end