From: Loqi Tamaroon <redmine@...>
Date: 2009-04-18T00:27:03+09:00
Subject: [ruby-core:23236] [Bug #1387] first(0) and last(0) behavior

Bug #1387: first(0) and last(0) behavior
http://redmine.ruby-lang.org/issues/show/1387

Author: Loqi Tamaroon
Status: Open, Priority: Normal
ruby -v: 1.8.6

I'm not sure if there was an explicit decision to have Array#first(0) and last(0) return the entire receiver, but it's messing me up slightly.

"abc".first(3) => "abc"
"abc".first(2) => "ab"
"abc".first(1) => "a"
"abc".first(0) => "abc"

There's similar behavior with last(0).

In my opinion, first(0) and last(0) should return a zero-length collection.

Is there a rationale for their current behavior, or is it a mistake?


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