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Re: How to find out if X is an element in an array?

by Roger (Parson)
on Sep 10, 2003 at 03:21 UTC ( #290287=note: print w/replies, xml ) Need Help??


⭐ in reply to How to find out if X is an element in an array?

$X = "x";
@array = qw / x y z 1 2 3 /;
return exists {map { $_ => 1 } @array}->{$X};

[download]
The above code returns 1 if element found, undef if not found.

Replies are listed 'Best First'.
Re: Answer: How to find out if X is an element in an array?
by NetWallah (Canon) on Sep 10, 2003 at 06:29 UTC
    Hmm - This method will not scale well because it creates a temporary hash. If this is a repeated search in a large array, you would be doing a lot of memory management.

    Here is the equivalent code, using grep: 

    $X = "x";
@array = qw / x y z 1 2 3 /;
return scalar grep(/^$X$/,@array) > 0;

    [download]
    The "scalar" isnt really necessary, but it documents the fact that grep is called in a scalar context.
[reply]
[d/l]

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