method

each_with_object

Ruby on Rails latest stable (v6.1.7.7) - 0 notes - Class: Enumerable

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What's this?

Method deprecated or moved

This method is deprecated or moved on the latest stable version. The last existing version (v3.2.13) is shown here.

each_with_object(memo) 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)
    return to_enum :each_with_object, memo unless block_given?
    each do |element|
      yield element, memo
    end
    memo
  end

each_with_object

Related methods

Method deprecated or moved

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