Re: Code clarification - use of map and $$

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Re^2: Code clarification - use of map and $$_ by Anonymous Monk on Aug 09, 2016 at 17:25 UTC
Collective huge thank you to everybody who contributed to this thread! Much to learn and read. Again: thanks!	[reply]
Re^2: Code clarification - use of map and $$_ by Anonymous Monk on Aug 09, 2016 at 14:05 UTC
Thanks for that. Why exactly would dereferencing be used here? Why not direct access to the variable?	[reply]
Re^3: Code clarification - use of map and $$_ by davido (Cardinal) on Aug 09, 2016 at 14:56 UTC
Because the list returned by `@{$r{$k}}` is a list of array references. On each iteration of the `map` loop one element is passed in from the array, `@{$r{$k}}`, to `$_`. That element is a reference to an array. Thus, to act upon its contents, you dereference it. Dave	[reply] [d/l] [select]
Re^3: Code clarification - use of map and $$_ by LanX (Saint) on Aug 09, 2016 at 14:55 UTC
> Why exactly would dereferencing be used here? Why not direct access to the variable? without digging too deep into this code ... `map` can only iterate over scalars. I.e. like a list of $array_refs, if you want to address different arrays ... > Why not direct access to the variable? if you mean something like `@array` as the "direct" variable, you CAN'T do something like `map { $_[0]++ } (@a,@b,@c)` to increment the first element of each array. The real problem with that code is the laziness of the author to use a clear style. Cheers Rolf _{(addicted to the Perl Programming Language and ☆☆☆☆ :) Je suis Charlie!}	[reply] [d/l] [select]
Re^3: Code clarification - use of map and $$_ by Corion (Patriarch) on Aug 09, 2016 at 14:06 UTC
I don't know. Maybe ask the original author of the script.	[reply]