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RE: RE: RE: My favorite looping mechanism in Perl is:

by marcos (Scribe)
on May 15, 2000 at 12:35 UTC ( [id://11578]=note: print w/replies, xml ) Need Help??


in reply to RE: RE: My favorite looping mechanism in Perl is:
in thread My favorite looping mechanism in Perl is:

Thank you for your note, but could you please explain why using map in void context is "a wasteful"? Is it a problem of code performance and/or optimization?
TIA, marcos

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RE: RE: RE: RE: My favorite looping mechanism in Perl is:
by btrott (Parson) on May 15, 2000 at 20:56 UTC
    I believe it is/was wasteful because of the list that map builds to return to you. The normal use of map is like this:
    my @returned = map BLOCK LIST;
    In order to fill up @returned, map has to build a list. If you're not going to be using that list (if you're using map in void context), you've wasted that storage and the processing time needed to allocate that memory.

    However, I've read bits and pieces of this discussion in the past, and I had thought that this list-building was optimized away when map is used in a void context. Is this the case, or was that merely a suggestion? :)

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