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https://github.com/rails/rails/blob/master/activesupport/lib/active_support/core_ext/enumerable.rb
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https://www.rubydoc.info/gems/activesupport/Enumerable:index_by
Defined in: lib/active_support/core_ext/enumerable.rb index_by ⇒ Object. Convert an enumerable to a hash keying it by the block return value.
https://bugs.ruby-lang.org/issues/8490
It seems to be a common sense to have the useful implementation of Enumerable#index_by as in ActiveSupport. index_by acts like group_by but only maps a single record, instead of an array, keeping the last match only.
https://apidock.com/rails/Enumerable/group_by
group_by() public. Collect an enumerable into sets, grouped by the result of a block. Useful, for example, for grouping records by date. ... Returns an ActiveSupport::OrderedHash, which is a subclass of Hash that preserves order. If you’re running Ruby 1.9, it is simply an alias for Hash.
https://guides.rubyonrails.org/active_support_core_extensions.html
Active Support Core Extensions. Active Support is the Ruby on Rails component responsible for providing Ruby language extensions, utilities, and other transversal stuff. It offers a richer bottom-line at the language level, targeted both at the development of Rails applications, and at …
https://api.rubyonrails.org/v2.3.8/classes/Enumerable.html
The negative of the Enumerable#include?. Returns true if the collection does not include the object. [ show source]
https://api.rubyonrails.org/classes/Enumerable.html
The negative of the Enumerable#include?.Returns true if the collection does not include the object.
https://msp-greg.github.io/rails_stable/Enumerable.html
123456789_123456789_123456789_123456789_123456789_ Module: Enumerable. Relationships & Source Files: Extension / Inclusion / Inheritance Descendants
https://www.rubydoc.info/docs/rails/4.0.0/Enumerable
Returns true if the enumerable has more than 1 element. Functionally equivalent to enum.to_a.size > 1enum.to_a.size > 1
https://github.com/rails/rails/pull/25202
Enumerable#sum was added in ruby/ruby@41ef7ec use Enumerable#sum if its available, to replicate how we enhance on usage of native Aray sum. rm extra check that passed identity is numeric for Array...
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