unique_mapping - partition an array into groups mapping unique_mapping(array arr, string fun, object ob, ...); mapping unique_mapping(array arr, function f, ...); unique_mapping() evaluates the function 'f' with each element of the array 'arr', and constructs a mapping with the return values as keys, and subarrays of elements that returned value value as values. See also: unique_array Tim Hollebeek Beek@ZorkMUD, Lima Bean, IdeaExchange, and elsewhere