Re^2: check if a number is in a list

(for OP's benefit) the hash method:

my @array = (10,11,12,13,14,20,21,25);
my $x = 1;
my %array = map { $_ => undef } @array;
if( exists $array{$x} ){
  ...
}
[download]

Comment on Re^2: check if a number is in a list Download Code

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Re^3: check if a number is in a list by Ido (Hermit) on Jun 26, 2005 at 05:21 UTC
Is the map really needed? What about: `my %array; @array{@array}=();` [download]	[reply] [d/l]
Re^3: check if a number is in a list by 5mi11er (Deacon) on Jun 27, 2005 at 16:33 UTC
No, the map isn't really needed, and might cause confusion, but if it does, I'd bet the @array{@array}=(); idiom isn't going to be understood either. OP, in both cases above, the idea is to have the numbers in your list to actually be in a hash rather than an array. The map and @array{@array} thing are simply shorthand ways to take your existing array and make it into a hash. Depending on your actual implementation, you might be better off if you created and added/removed the numbers meant to be within the list, and did so using hash operations instead. Then you wouldn't need the shorthand idioms above. -Scott	[reply]