Re^2: why not listed foreach and if?

map is for transformation of a list of items, not iteration. Using it in void context like this (for the side effect throwing away the return values) is obfuscated code.

The cake is a lie.
The cake is a lie.
The cake is a lie.

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Re^3: why not listed foreach and if? by sectokia (Friar) on Jun 17, 2024 at 23:32 UTC
perldoc for map starts by saying that map "Evaluates the BLOCK or EXPR for each element of LIST ...". So map is primarily an iterator.	[reply]
Re^4: why not listed foreach and if? by Fletch (Bishop) on Jun 19, 2024 at 04:08 UTC
And the very next part of that sentence then reads "and composes a list of the results of each such evaluation." It's not for general purpose iteration. Also quoth Perl Best Practices (Chapter 6): This function [`map`] is specifically aimed at those situations when you want to process a list of values, to create some kind of related list. In fact for a while (until 5.8-ish? looks like) there actually was a performance hit for (bad) code misusing `map` because the return value wasn't optimized away in void context so you'd pay to make the list of transformed values even though they weren't used.. Use `for` (or `foreach` or `while`) for general iteration, use `map` for transformation, or `grep` for filtering; otherwise you're misleading readers about what code is doing. The cake is a lie. The cake is a lie. The cake is a lie.	[reply] [d/l] [select]