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perlfunc:reverse

by gods
on Aug 24, 1999 at 22:42 UTC ( #244=perlfunc: print w/replies, xml ) Need Help??

reverse

See 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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[james28909]: thanks
[james28909]: what i am trying to do is track state of a chat based application. i need to be able to store the channels and such for a user, and when they join a new server/channel i need to be able to update that feild.
[james28909]: do you think OO would best suite that?
[karlgoethebier]: james28909: The last two are not mainstream. You have been warned ;-)
[karlgoethebier]: james28909: I don't know. Try it.
[james28909]: foreach server this bot is on, the gateway sends me a json response, which i parse out all the info with JSON, and this response has user information, i need to be able to add a user, and then update the user info when they join/leave rooms ect

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