Module: Enumerable

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

Overview

helpers: truthy, coerce_to, yield1, yieldX, deny_frozen_access

Instance Method Summary collapse

Instance Method Details

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

Returns:



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# File 'opal/opal/corelib/enumerable.rb', line 18

def all?(pattern = undefined, &block)
  if `pattern !== undefined`
    each do |*value|
      comparable = `comparableForPattern(value)`

      return false unless pattern.public_send(:===, *comparable)
    end
  elsif 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?(pattern = undefined, &block) ⇒ Boolean

Returns:



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# File 'opal/opal/corelib/enumerable.rb', line 42

def any?(pattern = undefined, &block)
  if `pattern !== undefined`
    each do |*value|
      comparable = `comparableForPattern(value)`

      return true if pattern.public_send(:===, *comparable)
    end
  elsif 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 66

def chunk(&block)
  return to_enum(:chunk) { 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 = $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 



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# File 'opal/opal/corelib/enumerable.rb', line 105

def chunk_while(&block)
  ::Kernel.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 111

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

  %x{
    var result = [];

    self.$each.$$p = function() {
      var value = $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 129

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

#compact ⇒ Object 



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# File 'opal/opal/corelib/enumerable.rb', line 134

def compact
  to_a.compact
end

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



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

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

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

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

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

  result
end

#cycle(n = nil, &block) ⇒ Object 



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# File 'opal/opal/corelib/enumerable.rb', line 162

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

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

    return if `n <= 0`
  end

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

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

      all.push(param);
    }

    self.$each();

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

    if (n === nil) {
      while (true) {
        for (i = 0, length = all.length; i < length; i++) {
          value = $yield1(block, all[i]);
        }
      }
    }
    else {
      while (n > 1) {
        for (i = 0, length = all.length; i < length; i++) {
          value = $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 215

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 238

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

  if `number < 0`
    ::Kernel.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 263

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 = $yield1(block, param);

        if (!$truthy(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 292

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

  n = ::Opal.try_convert n, ::Integer, :to_int

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

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

  %x{
    var buffer = [];

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

    self.$each();

    return self;
  }
end

#each_entry(*data, &block) ⇒ Object 



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# File 'opal/opal/corelib/enumerable.rb', line 336

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`)};

      $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 354

def each_slice(n, &block)
  n = `$coerce_to(#{n}, #{::Integer}, 'to_int')`

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

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

  %x{
    var slice = []

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

      slice.push(param);

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

    self.$each();

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

  self
end

#each_with_index(*args, &block) ⇒ Object 



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# File 'opal/opal/corelib/enumerable.rb', line 388

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

  %x{
    var index = 0;

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

      block(param, index);

      index++;
    };

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

  self
end

#each_with_object(object, &block) ⇒ Object 



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# File 'opal/opal/corelib/enumerable.rb', line 408

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

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

      block(param, object);
    };

    self.$each();
  }

  object
end

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



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# File 'opal/opal/corelib/enumerable.rb', line 424

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 653

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

#filter_map(&block) ⇒ Object 



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# File 'opal/opal/corelib/enumerable.rb', line 438

def filter_map(&block)
  return enum_for(:filter_map) { enumerator_size } unless block_given?

  map(&block).select(&:itself)
end

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



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# File 'opal/opal/corelib/enumerable.rb', line 444

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

  %x{
    var result = [];

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

      if ($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 465

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 497

def first(number = undefined)
  if `number === undefined`
    each do |value|
      return value
    end
  else
    result = []
    number = `$coerce_to(number, #{::Integer}, 'to_int')`

    if `number < 0`
      ::Kernel.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 528

def grep(pattern, &block)
  result = []

  each do |*value|
    cmp = `comparableForPattern(value)`
    next unless pattern.__send__(:===, *cmp)
    if block_given?
      value = [value] if value.length > 1
      value = yield(*value)
    elsif value.length <= 1
      value = value[0]
    end

    result.push(value)
  end

  result
end

#grep_v(pattern, &block) ⇒ Object 



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# File 'opal/opal/corelib/enumerable.rb', line 547

def grep_v(pattern, &block)
  result = []

  each do |*value|
    cmp = `comparableForPattern(value)`
    next if pattern.__send__(:===, *cmp)
    if block_given?
      value = [value] if value.length > 1
      value = yield(*value)
    elsif value.length <= 1
      value = value[0]
    end

    result.push(value)
  end

  result
end

#group_by(&block) ⇒ Object 



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# File 'opal/opal/corelib/enumerable.rb', line 566

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

  hash = {}

  %x{
    var result;

    self.$each.$$p = function() {
      var param = #{::Opal.destructure(`arguments`)},
          value = $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 591

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 601

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 = $yieldX(block, [result, value]);

        result = value;
      };
    }
    else {
      if (sym === undefined) {
        if (!#{::Symbol === object}) {
          #{::Kernel.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 647

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

#max(n = undefined, &block) ⇒ Object 



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# File 'opal/opal/corelib/enumerable.rb', line 657

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 = $yieldX(block, [item, result]);
        } else {
          value = #{`item` <=> `result`};
        }

        if (value === nil) {
          #{::Kernel.raise ::ArgumentError, 'comparison failed'};
        }

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

      self.$each();

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

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

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

#max_by(n = nil, &block) ⇒ Object 



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# File 'opal/opal/corelib/enumerable.rb', line 700

def max_by(n = nil, &block)
  return enum_for(:max_by, n) { enumerator_size } unless block

  unless n.nil?
    return sort_by(&block).reverse.take n
  end

  %x{
    var result,
        by;

    self.$each.$$p = function() {
      var param = #{::Opal.destructure(`arguments`)},
          value = $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(n = nil, &block) ⇒ Object 



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# File 'opal/opal/corelib/enumerable.rb', line 733

def min(n = nil, &block)
  unless n.nil?
    if block_given?
      return sort { |a, b| yield a, b }.take n
    else
      return sort.take n
    end
  end

  %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) {
          #{::Kernel.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(n = nil, &block) ⇒ Object 



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# File 'opal/opal/corelib/enumerable.rb', line 786

def min_by(n = nil, &block)
  return enum_for(:min_by, n) { enumerator_size } unless block

  unless n.nil?
    return sort_by(&block).take n
  end

  %x{
    var result,
        by;

    self.$each.$$p = function() {
      var param = #{::Opal.destructure(`arguments`)},
          value = $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 819

def minmax(&block)
  block ||= ::Kernel.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) {
          #{::Kernel.raise ::ArgumentError, 'comparison failed'}
        } else if (min_cmp > 0) {
          min = element;
        }

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

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

    self.$each();

    return [min, max];
  }
end

#minmax_by(&block) ⇒ Object 



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# File 'opal/opal/corelib/enumerable.rb', line 855

def minmax_by(&block)
  return enum_for(:minmax_by) { enumerator_size } unless block

  %x{
    var min_result = nil,
        max_result = nil,
        min_by,
        max_by;

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

      if ((min_by === undefined) || #{`value` <=> `min_by`} < 0) {
        min_result = param;
        min_by     = value;
      }

      if ((max_by === undefined) || #{`value` <=> `max_by`} > 0) {
        max_result = param;
        max_by     = value;
      }
    };

    self.$each();

    return [min_result, max_result];
  }
end

#none?(pattern = undefined, &block) ⇒ Boolean

Returns:



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# File 'opal/opal/corelib/enumerable.rb', line 885

def none?(pattern = undefined, &block)
  if `pattern !== undefined`
    each do |*value|
      comparable = `comparableForPattern(value)`

      return false if pattern.public_send(:===, *comparable)
    end
  elsif block_given?
    each do |*value|
      if yield(*value)
        return false
      end
    end
  else
    each do |*value|
      item = ::Opal.destructure(value)

      return false if item
    end
  end

  true
end

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

Returns:



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# File 'opal/opal/corelib/enumerable.rb', line 909

def one?(pattern = undefined, &block)
  count = 0

  if `pattern !== undefined`
    each do |*value|
      comparable = `comparableForPattern(value)`

      if pattern.public_send(:===, *comparable)
        count += 1
        return false if count > 1
      end
    end
  elsif block_given?
    each do |*value|
      next unless yield(*value)
      count += 1

      return false if count > 1
    end
  else
    each do |*value|
      next unless ::Opal.destructure(value)
      count += 1

      return false if count > 1
    end
  end

  count == 1
end

#partition(&block) ⇒ Object 



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# File 'opal/opal/corelib/enumerable.rb', line 940

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

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

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

      if ($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 964

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

  %x{
    var result = [];

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

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

    self.$each();

    return result;
  }
end

#reverse_each(&block) ⇒ Object 



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

def reverse_each(&block)
  return enum_for(:reverse_each) { 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--) {
      $yieldX(block, result[i]);
    }

    return result;
  }
end

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



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# File 'opal/opal/corelib/enumerable.rb', line 1069

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

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

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

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

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

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

        if ($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 1005

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

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

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

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

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

          slice.push(param);
        };
      }

      self.$each();

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

#slice_when(&block) ⇒ Object 



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# File 'opal/opal/corelib/enumerable.rb', line 1112

def slice_when(&block)
  ::Kernel.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 = $yieldX(block, [before, after]);

        last_after = after;

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

        if ($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 1150

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

#sort_by(&block) ⇒ Object 



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# File 'opal/opal/corelib/enumerable.rb', line 1156

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

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

#sum(initial = 0) ⇒ Object

This method implements the Kahan summation algorithm if it is possible to apply one.



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

def sum(initial = 0)
  result = initial
  compensation = 0

  each do |*args|
    item = if block_given?
             yield(*args)
           else
             ::Opal.destructure(args)
           end

    if ![::Float::INFINITY, -::Float::INFINITY].include?(item) && item.respond_to?(:-)
      y = item - compensation
      t = result + y
      compensation = (t - result) - y
      result = t
    else
      result += item
    end
  end

  result
end

#take(num) ⇒ Object 



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# File 'opal/opal/corelib/enumerable.rb', line 1192

def take(num)
  first(num)
end

#take_while(&block) ⇒ Object 



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# File 'opal/opal/corelib/enumerable.rb', line 1196

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

#tally(hash = undefined) ⇒ Object 



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# File 'opal/opal/corelib/enumerable.rb', line 1232

def tally(hash = undefined)
  `if (hash && hash !== nil) { $deny_frozen_access(hash); }`

  out = group_by(&:itself).transform_values(&:count)
  if hash
    out.each { |k, v| hash[k] = hash.fetch(k, 0) + v }
    hash
  else
    out
  end
end

#to_h(*args, &block) ⇒ Object 



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# File 'opal/opal/corelib/enumerable.rb', line 1244

def to_h(*args, &block)
  return map(&block).to_h(*args) if block_given?

  %x{
    var hash = #{{}};

    self.$each.$$p = function() {
      var param = #{::Opal.destructure(`arguments`)};
      var ary = #{::Opal.coerce_to?(`param`, ::Array, :to_ary)}, key, val;
      if (!ary.$$is_array) {
        #{::Kernel.raise ::TypeError, "wrong element type #{`ary`.class} (expected array)"}
      }
      if (ary.length !== 2) {
        #{::Kernel.raise ::ArgumentError, "wrong array length (expected 2, was #{`ary`.length})"}
      }
      key = ary[0];
      val = ary[1];

      Opal.hash_put(hash, key, val);
    };

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

    return hash;
  }
end

#uniq(&block) ⇒ Object 



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# File 'opal/opal/corelib/enumerable.rb', line 1212

def uniq(&block)
  hash = {}

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

    produced = if block_given?
                 yield(value)
               else
                 value
               end

    unless hash.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 1271

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