Sha256: 077a478c3dfc728387e50f2d390ce88ef92bbd0714dbf3293d9726e123fe3366
Contents?: true
Size: 605 Bytes
Versions: 26
Compression:
Stored size: 605 Bytes
Contents
module Enumerable
# Like #uniq, but determines uniqueness based on a given block.
#
# (-5..5).to_a.uniq_by {|i| i*i }
#
# produces
#
# [-5, -4, -3, -2, -1, 0]
#
def uniq_by #:yield:
h = {}; inject([]) {|a,x| h[yield(x)] ||= a << x}
end
end
# _____ _
# |_ _|__ ___| |_
# | |/ _ \/ __| __|
# | | __/\__ \ |_
# |_|\___||___/\__|
#
=begin test
require 'test/unit'
class TCEnumerable < Test::Unit::TestCase
def test_uniq_by
a = [-5, -4, -3, -2, -1, 0]
r = (-5..5).to_a.uniq_by{|i| i*i }
assert_equal( a, r )
end
end
=end
Version data entries
26 entries across 26 versions & 1 rubygems