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A related oddity is that map can modify its input, in addition to generating output. That leads to the pitfall of
my @new = map { s/foo/bar/; $_ } @old; # @old is modified along with @new! # should be my @new = map { s/foo/bar/; $_ } map {$_} @old;
If map couldn't modify its input, the whole "map in a void context" debate might never have happened. for would be used for modifying input, map would be used for generating new output. Of course, it's a tradeoff, giving up some liberty for safety.

Caution: Contents may have been coded under pressure.

In reply to Re^2: Perl oddities (s/// doesn't DWIM in map) by Roy Johnson
in thread Perl oddities by brian_d_foy

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