For me it's more a matter of clarity/readability for someone looking over my code, particularly with nested maps like this (do you really find map { map { ... } @bar } @foo easier to mentally parse than foreach (@foo) { foreach (@bar) { ... } }?). But, you're right...it's mostly a stylistic thing and this is a classic example of TMTOWTDI.

Update: I tried a little test and foreach was actually significantly faster (for this particular test, that is):

#!perl -w
use strict;
use Benchmark;

Benchmark::cmpthese(-5, {
    'foreach' => sub { my $sum=0; foreach (1..100) { foreach (1..100) 
+{ $sum++ }}},
    'map' => sub {my $sum=0; map { map { $sum++ } (1..100) } (1..100) 
+},
});

[download]
------------------------------

         Rate     map foreach
map     345/s      --    -43%
foreach 603/s     75%      --

[download]

What gives?

-b

In reply to Re^3: how to avoid nested looping? by bgreenlee
in thread how to avoid nested looping? by lamp

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