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Re^4: hash array

by Anonymous Monk
on Oct 09, 2012 at 11:54 UTC ( #997992=note: print w/ replies, xml ) Need Help??


in reply to Re^3: hash array
in thread hash array

thanks my issue got solved .... can u please explain about "map"


Comment on Re^4: hash array
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Re^5: hash array
by bart (Canon) on Oct 09, 2012 at 18:25 UTC
    map is a looping function to apply an expression or a block to every item in a list (each item in turn assigned to $_), and collect/return the list of results. It's like:
    my @results; foreach(@_) { push @results, &$CODE(); } return @results;
    where $CODE is the expression (delimited by a comma) or block (no delimiter) in the first argument.

    example:

    @output = map $_*2, 1 .. 10;
    which is identical in result to
    @output = map { $_*2 } 1 .. 10;
    and which return the even numbers from 2 to 20; the double of all numbers between 1 and 10.
Re^5: hash array
by McA (Priest) on Oct 09, 2012 at 11:58 UTC

    Please have a look at perldoc -f map. If there's something you don't understand, allmost everyone will help you.

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