From: "David A. Black" <dblack@...>
Date: 2008-04-12T01:32:18+09:00
Subject: Re: delete_if, select and (lack of) delete_if!, self.POLS == false

Hi --

On Sat, 12 Apr 2008, Saku Ytti wrote:

> Hey everyone,
>
> I was looking today for version of Array#select that would mutate the array
> by deleting selected elements from it.
> I first looked at delete_if, then noticed that it actually mutates original
> array and returns mutated array. I wonder would it make sense for delete_if
> not to mutate and return new array and delete_if! to mutate and return deleted
> elements?
>
> Of course what I want is simple method to implement, it just seems pretty
> typical desire for Array#select usage cases and also perhaps mutating
> delete_if is as well bit unexpected? Problem is, suggested change would
> break many current delete_if usage cases.

You should use #reject, which is non-destructive.


David

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