keys

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          keys() - return an array of the keys from the (key, value)
          pairs in a mapping

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          mixed *keys( mapping m );

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          keys() returns an array of keys (indices) corresponding to
          the keys in the (key, value) pairs stored in the mapping m.

          For example, if:

               mapping m;
               m = (["hp" : 35, "sp" : 42, "mass" : 100]);

          then

               keys(m) == ({"hp", "sp", "mass"})

          Note: the keys will not be returned in any apparent order.
          However, they will be returned in the same order as the
          corresponding values (returned by the values() efun).

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          values(3), each(3)

     Page 1                                          (printed 3/16/95)