in reply to multiple local vars in a foreach loop

The simple answer

my %hash=@keys;

already does what you want. =)


The long answer!

Regarding your initial question: "unfortunately not"!

Perl5 doesn't provide a built-in way to have multiple loop vars in foreach.

There are several workarounds with while loops:

but these workarounds have been discussed so often in the monastery that I'd prefer to link them after finding them.


In this case (ignoring the solution on top) I would do something with splice:

DB<113> @array = (a =>1,b=>2) => ("a", 1, "b", 2) DB<114> while ( my ($key,$val) = splice(@array,0,2) ) { $hash{$key}=$val; } DB<115> \%hash => { a => 1, b => 2 } DB<116> \@array # emptied! => []

You need to copy @array in case I wanna keep the initial elements after the loop.

Older discussions

googling the monastery for splice+natatime

Cheers Rolf


Originally I proposed this code

while(@array) { $hash{shift @array} = shift @array; }

But I was bitten by precedence, the code does it the wrong way around:

DB<108> @array = ( a => 1, b => 2 ) => ("a", 1, "b", 2) DB<109> $hash{shift @array} =shift @array while @array DB<110> \%hash => { 1 => "a", 2 => "b" }