Re: How do I loop through a list two or more elements at a time?


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Re: How do I loop through a list two or more elements at a time?

by jeroenes (Priest)

on Oct 24, 2001 at 15:37 UTC ( [id://121081]=note: print w/replies, xml )

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⭐ in reply to How do I loop through a list two or more elements at a time?

For a real answer now: create your list as an array of arrays, loop on the outer array.

print "$_->[0] - $_->[1]\n" for @LoL;
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If you start with a flat list, you create the LoL with davorg's solution:

my @LoL;
while(my @items = splice( @list, 0, 2) ){
   push @LoL, [@items];
}
[download]

or non-destructive:

my $size = 2;
die "Uneven list" if @list % $size;
my @LoL;
for my $index ( 0.. $#list ){
  my $rem = $index % $size;
  $LoL[($index - $rem)/$size]->[$rem] = $list[$index];
}
[download]

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