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Re: My 'perldar' tells me there is a 'better' solution for this list operation

by OfficeLinebacker (Chaplain)
on Nov 03, 2006 at 22:45 UTC ( [id://582189]=note: print w/replies, xml ) Need Help??


in reply to My 'perldar' tells me there is a 'better' solution for this list operation

I see that two responses use a construct like 
my %h1;
@h1{@l2}=();

[download]
I must admit I have seen this before (especially the second line) and I don't understand it. Is it just shorthand for populating a hash's keys collection with the elements of an array? Almost like
keys(%h1)=@l2;

?

[download]
Thanks,
T
P.S. I had no other word for that kind of intuitive feel for coding.

_________________________________________________________________________________

I like computer programming because it's like Legos for the mind.

Replies are listed 'Best First'.
Re^2: My 'perldar' tells me there is a 'better' solution for this list operation
by revdiablo (Prior) on Nov 04, 2006 at 01:45 UTC

    A couple of quick examples may make it easier to understand what a hash slice is doing. This code:

    @hash{"one", "two", "three"} = 1 .. 3;

    [download]

    Is equivalent to:

    ($hash{one}, $hash{two}, $hash{three}) = 1 .. 3;

    [download]

    And likewise, these are equivalent:

    my @list = @hash{"one", "two", "three"};

    [download]

    and

    my @list = ($hash{one}, $hash{two}, $hash{three});

    [download]
[reply]
[d/l]
[select]
Re^2: My 'perldar' tells me there is a 'better' solution for this list operation
by Roy Johnson (Monsignor) on Nov 03, 2006 at 22:53 UTC
    It's a hash slice, for populating multiple values of a hash from a list.
    Caution: Contents may have been coded under pressure.
[reply]

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