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Re^5: hash array

by bart (Canon)
on Oct 09, 2012 at 18:25 UTC ( #998051=note: print w/replies, xml ) Need Help??


in reply to Re^4: hash array
in thread hash array

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.

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