Re^4: How to check if a variable's value is equal to a member of a list of values

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

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)

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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]

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