From: "mame (Yusuke Endoh)" <mame@...>
Date: 2012-03-25T14:18:27+09:00
Subject: [ruby-core:43602] [ruby-trunk - Feature #4247][Assigned] New features for Array#sample, Array#choice


Issue #4247 has been updated by mame (Yusuke Endoh).

Description updated
Status changed from Open to Assigned
Assignee set to mame (Yusuke Endoh)


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Feature #4247: New features for Array#sample, Array#choice
https://bugs.ruby-lang.org/issues/4247#change-25098

Author: oj (Yoji Ojima)
Status: Assigned
Priority: Normal
Assignee: mame (Yusuke Endoh)
Category: 
Target version: 


=begin
 We are planning to add the following features of the random sampling to Array.
 
 1. Weighted random sampling.
 2. Sampling with replacement.
 3. Iteration.
 
 It is discussed in ruby-dev (Feature #3647 and #4147).
 
 
 API will be:
 
 Array#sample([size, [opt]])
   - Random selection without replacement.
   - Returns a new array when size is specified.
   - opt:
       weight: proc or array
       random: Random instance
 
 Array#choice([size, [opt]])
   - Random selection with replacement.
   - Returns a new array when size is specified.
   - opt: same as above.
 
 Array#each_sample([opt])
   - Random selection iterator without replacement.
   - Choose a random element and yield it.
   - Returns an Enumerator if a block is not given.
   - opt: same as above.
 
 Array#each_choice([opt])
   - Random selection iterator with replacement.
   - Choose a random element and yield it.
   - Returns an Enumerator if a block is not given.
   - opt: same as above.
 
 
 Comments?
=end



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