From: Hans Mackowiak <lists@...>
Date: 2013-02-23T05:47:39+09:00
Subject: Re: Not able to understand the difference between "||=" and "|=".

ary | other_ary     -> new_ary

Set Union---Returns a new array by joining this array with
other_ary, removing duplicates.

  [ "a", "b", "c" ] | [ "c", "d", "a" ]
         #=> [ "a", "b", "c", "d" ]

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