From the perldoc page for map:
<cite>
Note that, because C<$_> is a reference into the list value, it can be used to modify the elements of the array. While this is useful and supported, it can cause bizarre results if the LIST is not a named array. Using a regular C<foreach> loop for this purpose would be clearer in
most cases.
</cite>
so now, what are the cases where map { s/foo/bar/ } @goo is different from for (@goo) { s/foo/bar/ }? what "bizarre results" is it talking about?
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