File: drop_last.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 (20 lines) | stat: -rw-r--r-- 522 bytes parent folder | download | duplicates (3)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
unless Enumerable.method_defined? :drop_last
  module Enumerable
    # Drops the last n elements of an enumerable.
    #
    # @param n [Fixnum] the number of elements to drop
    # @return [Array] an array containing the remaining elements
    #
    # @example
    #   [1, 2, 3].drop_last(1) #=> [1, 2]
    #   [].drop_last(5) #=> []
    def drop_last(n)
      fail ArgumentError, 'attempt to drop negative size' if n < 0

      ary = to_a

      return [] if n > ary.size
      ary[0...(ary.size - n)]
    end
  end
end