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Re: Re: Re: Re: Scalars, Lists, and Arrays

by chromatic (Archbishop)
on Apr 13, 2001 at 20:39 UTC ( #72385=note: print w/replies, xml ) Need Help??

in reply to Re: Re: Re: Scalars, Lists, and Arrays
in thread Scalars, Lists, and Arrays

Void context is where you have an expression (not to abuse Dominus' terminology too much) that doesn't go anywhere. For example, if you had:
open(FILE, $filename) or die "Can't open $filename: $!"; "nothing to see here"; close FILE;
Ignoring the fact that the program does nothing, the second line is a scalar expression (help me out here, if I abuse verbiage) in void context.

When you abuse map to iterate over a list and don't assign the results to anything, you're using map in void context.

It's generally not useful, but if you have an expression that can spend a lot of time creating a result value of some sort, it can be inefficient to use void context.

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