map BLOCK LIST
map EXPR,LIST
Evaluates the BLOCK or EXPR for each element of LIST (locally setting $_ to each
element) and returns the list value composed of the results of each such
evaluation. Evaluates BLOCK or EXPR in a list context, so each element of LIST
may produce zero, one, or more elements in the returned value.
@chars = map(chr, @nums);
translates a list of numbers to the corresponding characters. And
%hash = map {&key($_), $_} @array;
is just a funny way to write
%hash = ();
foreach $_ (@array) {
$hash{&key($_)} = $_;
}
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