How can I access the index variable in map?


Do you know where your variables are?
	PerlMonks

by Anonymous Monk

on Nov 02, 2000 at 07:02 UTC ( [id://39590]=perlquestion: print w/replies, xml )

Need Help??

Anonymous Monk has asked for the wisdom of the Perl Monks concerning the following question: ⭐ (arrays)

# This works:

@a = (1,1,1);
@b = (2,2,2);
foreach $i (0 .. $#a) {
  $a[$i] += $b[$i];
}
[download]

but I'd like to use map. Is there a way to access the map index [$i] variable so I can do something like this:

@a = map $a[$i] + $_, @b;
[download]

Or is it simply not worth it?

Originally posted as a Categorized Question.

Comment on How can I access the index variable in map? Select or Download Code

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Re: How can I access the index variable in map?⭐ by Kanji (Parson) on Nov 02, 2000 at 08:23 UTC
Try ... `@a = map { $a[$_] + $b[$_] } 0 .. $#b;` ... or ... `my $i = 0; @a = map { $a[$i++] + $_ } @b;` [download]	[reply] [d/l] [select]
Re: How can I access the index variable in map?⭐ by chromatic (Archbishop) on Nov 02, 2000 at 07:48 UTC
To my knowledge, there's no index iterator in the map construct, presumably because it operates on lists (not just arrays). Stick with a for loop of some kind.	[reply]

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