On Thu, 28 Nov 2002, Ramprasad A Padmanabhan wrote:
> Which is the quickest way of converting an array to hash keys
>
> I have an array
> @ARRAY = qw ( a b c d e );
>
> # Convert array to hash keys , so can easily check for exists
> # The values of the hash are immaterial to me
>
> @HASH{@ARRAY}=@ARRAY;
>
> ....
> ....
> foreach (@SOME_OTHER_ARRAY) {
> next if(exists($HASH{$_})); # This is why I require a hash
> .....
> ....
> }
>
>
> Can I have a faster way than this @HASH{@ARRAY} = @ARRAY;
Why do you think this is slow? Some other options are to use for or map...
I did a benchmark and a hash slice seems to be the fastest. If you don't
care about the values you can do this
@HASH{@ARRAY} = ();
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