Module: Enumerable

Defined in:
lib/active_support/core_ext/enumerable.rb

Overview

:nodoc:

Instance Method Summary collapse

Instance Method Details

#first_match ⇒ Object 



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# File 'lib/active_support/core_ext/enumerable.rb', line 2

def first_match
  match = nil
  each do |items|
    break if match = yield(items)
  end
  match
end

#group_by ⇒ Object

Collect an enumerable into sets, grouped by the result of a block. Useful, for example, for grouping records by date.

e.g. 

latest_transcripts.group_by(&:day).each do |day, transcripts| 
  p "#{day} -> #{transcripts.map(&:class) * ', '}"
end
"2006-03-01 -> Transcript"
"2006-02-28 -> Transcript"
"2006-02-27 -> Transcript, Transcript"
"2006-02-26 -> Transcript, Transcript"
"2006-02-25 -> Transcript"
"2006-02-24 -> Transcript, Transcript"
"2006-02-23 -> Transcript"



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# File 'lib/active_support/core_ext/enumerable.rb', line 25

def group_by
  inject({}) do |groups, element|
    (groups[yield(element)] ||= []) << element
    groups
  end
end