From: Intransition <transfire@...>
Date: 2012-06-26T04:59:23+09:00
Subject: Re: Array#sample is Set#sample and not Array#sample !

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On Monday, June 25, 2012 10:53:51 AM UTC-4, Michel Demazure wrote:
>
> Arrays are ordered, sets are not. Sampling an array should give random 
> elements in the good order. But : 
>
> irb(main):001:0> (0..10).to_a.sample(5) 
> => [8, 10, 4, 6, 7] 
>
> Today's Array#sample actually is Set#sample, but Set#sample does not 
> exist. 
>
> irb(main):002:0> Set.new((0..10)).sample(5) 
> NoMethodError: undefined method `sample' for #<Set: {0, 1, 2, 3, 4, 5, 
> 6, 7, 8, 9, 10}> 
>

I think that would require a different method, say #ordered_sample.

If you write it and I'll add it to Facets random.rb.


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<br><br>On Monday, June 25, 2012 10:53:51 AM UTC-4, Michel Demazure wrote:<blockquote class="gmail_quote" style="margin: 0;margin-left: 0.8ex;border-left: 1px #ccc solid;padding-left: 1ex;">Arrays are ordered, sets are not. Sampling an array should give random
<br>elements in the good order. But :
<br>
<br>irb(main):001:0&gt; (0..10).to_a.sample(5)
<br>=&gt; [8, 10, 4, 6, 7]
<br>
<br>Today's Array#sample actually is Set#sample, but Set#sample does not
<br>exist.
<br>
<br>irb(main):002:0&gt; Set.new((0..10)).sample(5)
<br>NoMethodError: undefined method `sample' for #&lt;Set: {0, 1, 2, 3, 4, 5,
<br>6, 7, 8, 9, 10}&gt;
<br></blockquote><div><br></div><div>I think that would require a different method, say #ordered_sample.</div><div><br></div><div>If you write it and I'll add it to Facets random.rb.</div><div><br></div>
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