note
ciderpunx
<p>
I'd normally use a slightly simpler version of <a href="http://perlmonks.org/?node_id=401112">JohnGG</a>'s splice approach. Something like
<code>
my @arr = qw/1 2 3 4 5 6 7 8/;
while(my ($x,$y) = splice @arr,0,2) {
say "$x => $y";
}
</code>
</p>
<p>
Something I've needed in the past was to get two arrays (odds and evens). Grep can do this. You could combine them into a hash thus:
<code>
my @arr = qw/1 2 3 4 5 6 7 8/;
my ($j,$i)=(0,0);
my ($x,$y) = ([grep { ++$i % 2} @arr] , [grep {$j++ % 2} @arr]);
my %hash;
@hash{@{$x}}=@{$y};
for(keys %hash) {
say "$_ => $hash{$_}"
}
</code>
Gives us:
<code>
1 => 2
3 => 4
7 => 8
5 => 6
</code>
Or you could iterate them (which is safer if some x may be undef)
<code>
my @arr = qw/1 2 3 4 5 6 7 8/;
push @arr, undef;
push @arr, 9;
my ($j,$i)=(0,0);
my ($x,$y) = ([grep { ++$i % 2} @arr] , [grep {$j++ % 2} @arr]);
$i=0;
for(@{$x}){
say $_ ." => " . $y->[$i++] if($_);
}
</code>
Obviously that doesn't scale to big arrays. I'm sure <a href="http://search.cpan.org/perldoc?List%3A%3AMoreUtils">List::MoreUtils</a> is always the better approach.
</p>
<br /><br />
<div class="pmsig"><div class="pmsig-373188">
<br />--<br />
<a href="http://charlieharvey.org.uk/">Charlie Harvey</a>.
</div></div>
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