A Comparator that compares one comparable to another.
It returns the result of a.compareTo(b)
.
This utility function is used as the default comparator for ordering collections, for example in the List sort function.
static int compare(Comparable a, Comparable b) => a.compareTo(b);
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https://api.dartlang.org/stable/2.0.0/dart-core/Comparable/compare.html