.\"partitions a set of objects according to the action of a separator function
.DT
unique_array
$MUDNAME$ driver help
unique_array
.SH Name
.SI 5
unique_array() - partitions an array of objects into groups
.EI
.SH Synopsis
.SI 5
mixed *unique_array( object *obarr, string separator );
mixed *unique_array( object *obarr, string separator, mixed skip );
mixed *unique_array( mixed *arr, function f );
mixed *unique_array( mixed *arr, function f, mixed skip );
.EI
.SH Description
.SP 5 5
Groups objects/values together for which the `separator' function
returns the same value. In the first case, `separator' is a string function
name to try on each object. In the second case, the function f is called
with the element as the argument. If `skip' is passed, elements for which
the separator function returns the same as `skip' are omitted from the
return value.
.EP
.SH Return value
.SI 5
The return value is an array of arrays of the form:
.EI
({
({Same1:1, Same1:2, Same1:3, .... Same1:N }),
({Same2:1, Same2:2, Same2:3, .... Same2:N }),
({Same3:1, Same3:2, Same3:3, .... Same3:N }),
....
....
({SameM:1, SameM:2, SameM:3, .... SameM:N }),
})
.SP 5 5
i.e. an array of arrays, where each of the elements in the sub arrays returned
the same value as the other elements in the same sub array.
.EP
