##
# Array
#
# ISO 15.2.12
class Array
  ##
  # call-seq:
  #   array.each {|element| ... } -> self
  #   array.each -> Enumerator
  #
  # Calls the given block for each element of +self+
  # and pass the respective element.
  #
  # ISO 15.2.12.5.10
  def each(&block)
    return to_enum :each unless block

    idx = 0
    while idx < length
      block.call(self[idx])
      idx += 1
    end
    self
  end

  ##
  # call-seq:
  #   array.each_index {|index| ... } -> self
  #   array.each_index -> Enumerator
  #
  # Calls the given block for each element of +self+
  # and pass the index of the respective element.
  #
  # ISO 15.2.12.5.11
  def each_index(&block)
    return to_enum :each_index unless block

    idx = 0
    while idx < length
      block.call(idx)
      idx += 1
    end
    self
  end

  ##
  # call-seq:
  #   array.collect! {|element| ... } -> self
  #   array.collect! -> new_enumerator
  #
  # Calls the given block for each element of +self+
  # and pass the respective element. Each element will
  # be replaced by the resulting values.
  #
  # ISO 15.2.12.5.7
  def collect!(&block)
    return to_enum :collect! unless block

    idx = 0
    len = size
    while idx < len
      self[idx] = block.call(self[idx])
      idx += 1
    end
    self
  end

  ##
  # call-seq:
  #   array.map! {|element| ... } -> self
  #   array.map! -> new_enumerator
  #
  # Alias for collect!
  #
  # ISO 15.2.12.5.20
  alias map! collect!

  ##
  # call-seq:
  #   array.sort -> new_array
  #   array.sort {|a, b| ... } -> new_array
  #
  # Returns a new Array whose elements are those from +self+, sorted.
  def sort(&block)
    self.dup.sort!(&block)
  end

  ##
  # call-seq:
  #   array.to_a -> self
  #
  # Returns self, no need to convert.
  def to_a
    self
  end
  alias entries to_a

  ##
  # Array is enumerable
  # ISO 15.2.12.3
  include Enumerable
end