Created
August 1, 2009 20:31
-
-
Save bakineggs/159799 to your computer and use it in GitHub Desktop.
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
a patch is available at http://bakineggs.com/0001-Array-uniq-can-take-a-block.patch | |
dan@dan:~$ irb | |
irb(main):001:0> require 'rubygems' | |
=> true | |
irb(main):002:0> require 'active_support' | |
=> true | |
irb(main):003:0> class Array | |
irb(main):004:1> def uniq_with_block | |
irb(main):005:2> return uniq_without_block unless block_given? | |
irb(main):006:2> aggregator = {} | |
irb(main):007:2> each do |element| | |
irb(main):008:3* aggregator[yield(element)] ||= element | |
irb(main):009:3> end | |
irb(main):010:2> aggregator.values | |
irb(main):011:2> end | |
irb(main):012:1> alias_method_chain :uniq, :block | |
irb(main):013:1> def uniq_by | |
irb(main):014:2> select{ |item| select{|i| yield(i) == yield(item)}.index(item) == 0 } | |
irb(main):015:2> end | |
irb(main):016:1> end | |
irb(main):017:0> start = Time.now; (1..1000).to_a.uniq {|x| x % 1000}; Time.now - start | |
=> 0.001999 | |
irb(main):018:0> start = Time.now; (1..10000).to_a.uniq {|x| x % 1000}; Time.now - start | |
=> 0.014277 | |
irb(main):019:0> start = Time.now; (1..100000).to_a.uniq {|x| x % 1000}; Time.now - start | |
=> 0.135073 | |
irb(main):020:0> start = Time.now; (1..1000000).to_a.uniq {|x| x % 1000}; Time.now - start | |
=> 1.386128 | |
irb(main):021:0> start = Time.now; (1..10000000).to_a.uniq {|x| x % 1000}; Time.now - start | |
=> 35.404049 | |
irb(main):022:0> start = Time.now; (1..1000).to_a.uniq_by {|x| x % 1000}; Time.now - start | |
=> 1.251658 | |
irb(main):023:0> start = Time.now; (1..10000).to_a.uniq_by {|x| x % 1000}; Time.now - start | |
=> 124.187849 |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment