sortByKey method
Implementation
void sortByKey(K key, {Comparator<V>? compare}) {
var comparator =
compare ?? ((dynamic a, dynamic b) => a.compareTo(b) as int);
sort((m1, m2) {
var v1 = m1[key];
var v2 = m2[key];
if (v1 == null && v2 == null) {
return 0;
} else if (v1 == null) {
return 1;
} else if (v2 == null) {
return -1;
} else {
return comparator(v1, v2);
}
});
}