Re^3: Operator precedence (void context)

Of course there may be side effects. That is why you don't have to use -w. But there is no good reason to use grep and/or map solely for their side effects and there are good reasons to not do so. The warning would be:

    Use of map/grep in void context, use foreach instead
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If you have some perverse reason for doing such, then just turn off that warning. For people wanting help in catching simple errors, the warning will be useful.

- tye

Comment on Re^3: Operator precedence (void context) Download Code

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Void context by rir (Vicar) on Mar 08, 2003 at 18:29 UTC
As to how Perl can be improved. I agree with tye, `map` and `grep` should generate a warning in void context. I'd leave out the `foreach` recommendation except under `diagnostics`. In the same vein, Perl should have a wantvoid or wantbool operator so that the general case can be handled.	[reply] [d/l] [select]
•Re: Void context by merlyn (Sage) on Mar 08, 2003 at 18:40 UTC
Perl should have a wantvoid Well, wantarray already returns `undef` in a void context. Has for a very long time. -- Randal L. Schwartz, Perl hacker Be sure to read my standard disclaimer if this is a reply.	[reply]
Re: •Re: Void context by rir (Vicar) on Mar 08, 2003 at 19:01 UTC
Great. Thanks. Guess I'm going have to make an effort to catch up on the parts of Perl I "know". And guts was getting so tempting. rir -- only about seven years behind the times	[reply]