Re^2: promoting array to a hash

Yeah, there's nothing wrong with my code above, its just that I was wondering how to get rid of the unnecessary temporary variable %words. For example the following snippet...

@a = keys (a=>1,b=>2,c=>3);
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...produces the following error...

Type of arg 1 to keys must be hash (not list), blah, blah, blah
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...but I'm willing to bet that there is some syntax to fix the problem.

#This doesn't work
@a = keys %{(a=>1,b=>2,c=>3)};
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Re^3: promoting array to a hash by Zaxo (Archbishop) on Jun 13, 2004 at 05:41 UTC
Oh, Ok, you almost have it, `@a = sort keys %{{a=>1,b=>2,c=>3}};` or in terms of your original problem, `@a = sort keys %{{ map {$_ => undef} map {split} <> }};` Notice the replacement of parens with curlies. That makes the hashlike list into a hash reference to its contents, and the outer %{} dereferences it. I agree with your desire to avoid temporary variables, I try to do that, too, in perl. After Compline, Zaxo	[reply] [d/l] [select]
Re^4: promoting array to a hash by sleepingsquirrel (Chaplain) on Jun 13, 2004 at 06:07 UTC
thanks, that's just what I was looking for. `print "$_\n" for sort keys %{{map {$_,1} grep /^[a-z]+$/, (split /\s/, + join(" ",<>))}};` [download]	[reply] [d/l]