Module: Enumerable

Defined in:
lib/enumerable/associate.rb

Overview

Remove this as soon as it is integrated into ActiveSupport.

Instance Method Summary collapse

Instance Method Details

#associate(mapping = {}) ⇒ Object

Associates keys with values and returns a Hash.

If you have an enumerable of keys and want to associate them with values, pass a block that returns a value for the key:

[1, 2, 3].associate { |i| i ** 2 }
# => { 1 => 1, 2 => 4, 3 => 9 }

%w( tender love ).associate &:capitalize
# => {"tender"=>"Tender", "love"=>"Love"}

If you have an enumerable key/value pairs and want to associate them, omit the block and you’ll get a hash in return:

[[1, 2], [3, 4]].associate
# => { 1 => 2, 3 => 4 }



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# File 'lib/enumerable/associate.rb', line 18

def associate(mapping = {})
  if block_given?
    each_with_object(mapping) do |key, object|
      object[key] = yield(key)
    end
  else
    each_with_object(mapping) do |(key, value), object|
      object[key] = value
    end
  end
end