method

each_with_object

v2.2.1 - Show latest stable - 0 notes - Class: Enumerable

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What's this?

each_with_object(memo, &block) public

Iterates over a collection, passing the current element and the memo to the block. Handy for building up hashes or reducing collections down to one object. Examples:

  %w(foo bar).each_with_object({}) { |str, hsh| hsh[str] = str.upcase } #=> {'foo' => 'FOO', 'bar' => 'BAR'}

Note that you can’t use immutable objects like numbers, true or false as the memo. You would think the following returns 120, but since the memo is never changed, it does not.

  (1..5).each_with_object(1) { |value, memo| memo *= value } # => 1

Show source

# File activesupport/lib/active_support/core_ext/enumerable.rb, line 79
  def each_with_object(memo, &block)
    returning memo do |m|
      each do |element|
        block.call(element, m)
      end
    end
  end

each_with_object

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