This little Perl Benchmark shows that its better to iterate through an array as to manipulate via shift.For more about shift look at Perl array pop, push, shift, unshift.
#!/usr/bin/perl
use strict;
use warnings;
use Benchmark qw(:all) ;
cmpthese(-1, {
'shift' => sub {my @var = (1..4);print shift(@var); },
'iterate' => sub {my @var = (1..4);print $var[0]; },
});
We see its better to iterate as to shift from an array:
shift 1147836/s -- -4% iterate 1191563/s 4% --
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