From: Lars Haugseth <ruby-talk@...>
Date: 2012-04-11T20:25:04+09:00
Subject: Re: less absolutely horrible way to make sure array 1 only contains elements from array 2?

On 04/11/2012 01:16 PM, Lars Haugseth wrote:
>
> require 'set'
>
> valid_choices = Set[:a, :b, :c, :d, :e, :f]
>
> good = Set[:a, :b, :d, :e]
> good.subset? choices
>  => true
>
> bad = Set[:c, :f, :x, :y]
> bad.subset? choices
>  => false
>
> Note: you can use Array#to_set to convert an array to a set.
>

Should be:

  good.subset? valid_choices
  bad.subset? valid_choices

-- 
Lars Haugseth