Re^3: How to check if a variable's value is equal to a member of a list of values

Just to toss in a tidbit, and not trying to hijack the thread, but while benchmarking an alternative to using the smart match operator, I discovered that using map in scalar content performed better than grep.

if( map { /$string/ } @array) {
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rather than...

if( grep { /$string/ } @array) {
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I was surprised, because either way you'd be getting a non-undef value to satisfy the conditional, but map did it faster. I can post my code in a new thread if anyone's interested, otherwise, carry on! :)

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Re^4: How to check if a variable's value is equal to a member of a list of values by LanX (Saint) on Mar 26, 2013 at 21:37 UTC
`grep { TEST } LIST` is semantically equivalent to `map { TEST ? $_ : () } LIST` Seems obvious that more logic results in longer runtime. Don't you think so? Cheers Rolf ( addicted to the Perl Programming Language)	[reply] [d/l] [select]
Re^5: How to check if a variable's value is equal to a member of a list of values by dbuckhal (Chaplain) on Mar 26, 2013 at 22:55 UTC
Yes, I would agree that more logic increases runtime, but from your example, are you saying that `grep` should be faster? Please explain your example, so I understand you clearly. Personally, I have no idea how `grep`, `map`, or `~~` all work "under the hood". In your syntax, I see `grep` and `map` both iterating over the list, so my guess was they would have performed equally. I was surprised at my results.	[reply] [d/l] [select]
Re^6: How to check if a variable's value is equal to a member of a list of values by LanX (Saint) on Mar 26, 2013 at 23:00 UTC
> are you saying that grep should be faster? no I'm showing that `grep {TEST}` is more complex than `map {TEST}` Cheers Rolf ( addicted to the Perl Programming Language)	[reply] [d/l] [select]