[ruby-core:77330] Re: [Ruby trunk Feature#12775] Random subset of array
From:
Akzhan Abdulin <akzhan.abdulin@...>
Date:
2016-09-20 19:30:27 UTC
List:
ruby-core #77330
I think it should be not in Ruby core but in testing frameworks or in form of separate gem. 2016-09-20 9:05 GMT+03:00 <sawadatsuyoshi@gmail.com>: > Issue #12775 has been updated by Tsuyoshi Sawada. > > > Nobuyoshi Nakada wrote: > > Do you mean random size subset? > > I can't get how/why it is useful. > > Please elaborate with the use cases. > > Yes, I mean random subset with random size. The use cases are mainly for > testing. > > ---------------------------------------- > Feature #12775: Random subset of array > https://bugs.ruby-lang.org/issues/12775#change-60571 > > * Author: Tsuyoshi Sawada > * Status: Feedback > * Priority: Normal > * Assignee: > ---------------------------------------- > I often see use cases to randomly sample a subset from an array like this: > > ```ruby > a = [3, 2, 6, 2, 6, 1] > a.sample(rand(a.length + 1)) # => [2, 6, 6, 3] > ``` > > I request extending `Array#sample` to let it take an option (such as > `:arbitrary`) for doing that: > > ```ruby > a.sample(:arbitrary) # => [2, 6, 6, 3] > ``` > > or perhaps having an independent method (like `samples`) to do it. > > ```ruby > a.samples # => [2, 6, 6, 3] > ``` > > > > > -- > https://bugs.ruby-lang.org/ > > Unsubscribe: <mailto:ruby-core-request@ruby-lang.org?subject=unsubscribe> > <http://lists.ruby-lang.org/cgi-bin/mailman/options/ruby-core> > Unsubscribe: <mailto:ruby-core-request@ruby-lang.org?subject=unsubscribe> <http://lists.ruby-lang.org/cgi-bin/mailman/options/ruby-core>