File: take_last_while.rb

package info (click to toggle)
ruby-powerpack 0.1.1-4
  • links: PTS, VCS
  • area: main
  • in suites: bookworm, bullseye, buster, forky, sid, trixie
  • size: 492 kB
  • sloc: ruby: 819; makefile: 3
file content (17 lines) | stat: -rw-r--r-- 503 bytes parent folder | download | duplicates (3) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
 
unless Enumerable.method_defined? :take_last_while?
  module Enumerable
    # Take the last n elements of an enumerable meeting a certain predicate.
    #
    # @return [Array] an array containing the matching elements
    #
    # @example
    #   [1, 2, 3, 5].take_last_while(&:odd?) #=> [3, 5]
    def take_last_while
      return to_enum(:take_last_while) unless block_given?

      result = []
      reverse_each { |elem| yield(elem) ? result.unshift(elem) : break  }
      result
    end
  end
end