The signature of a generic comparison function.
A comparison function represents an ordering on a type of objects. A total ordering on a type means that for two values, either they are equal or one is greater than the other (and the latter must then be smaller than the former).
A Comparator function represents such a total ordering by returning
ais smaller than
ais equal to
ais greater than
typedef Comparator<T> = int Function(T a, T b);
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