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perlfunc:reverseby gods (Initiate) |
on Aug 24, 1999 at 22:42 UTC ( [id://244]=perlfunc: print w/replies, xml ) | Need Help?? |
reverseSee the current Perl documentation for reverse. Here is our local, out-dated (pre-5.6) version: reverse - flip a string or a list
reverse LIST
In list context, returns a list value consisting of the elements of LIST in the opposite order. In scalar context, concatenates the elements of LIST, and returns a string value consisting of those bytes, but in the opposite order.
print reverse <>; # line tac, last line first
undef $/; # for efficiency of <> print scalar reverse <>; # byte tac, last line tsrif This operator is also handy for inverting a hash, although there are some caveats. If a value is duplicated in the original hash, only one of those can be represented as a key in the inverted hash. Also, this has to unwind one hash and build a whole new one, which may take some time on a large hash.
%by_name = reverse %by_address; # Invert the hash |
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