map
map - apply a change to a list to get back a new list with the changes
map BLOCK LIST
map EXPR,LIST
Evaluates the BLOCK or EXPR for each element of LIST (locally setting
$_
to each
element) and returns the list value composed of the results of each such
evaluation. Evaluates BLOCK or EXPR in a list context, so each element of LIST
may produce zero, one, or more elements in the returned value.
<![CDATA[
@chars = map(chr, @nums);
]]>
translates a list of numbers to the corresponding characters. And
<![CDATA[
%hash = map { getkey($_) => $_ } @array;
]]>
is just a funny way to write
<![CDATA[
%hash = ();
foreach $_ (@array) {
$hash{getkey($_)} = $_;
}
]]>