instance method `uniq_by`

Ruby on Rails 3.0.20

Since v3.0.20 Last seen in v4.0.13

Available in: v3.0.20 v3.1.12 v3.2.22.5 v4.0.13

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uniq_by()

Return an unique array based on the criteria given as a proc.

[1, 2, 3, 4].uniq_by { |i| i.odd? }
# => [1, 2]

Source

# File activesupport/lib/active_support/core_ext/array/uniq_by.rb, line 7
  def uniq_by
    hash, array = {}, []
    each { |i| hash[yield(i)] ||= (array << i) }
    array
  end

Defined in activesupport/lib/active_support/core_ext/array/uniq_by.rb line 7 · View on GitHub · Improve this page · Find usages on GitHub

Defined in Array

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