insertInOrder method
Inserts each element in numbersToInsert before the first element that is >=
1, 4.insertInOrder(3, 2) returns 1, 2, 3, 4.
Does not sort the entire result. ascending or descending can sort.
Implementation
Set<int> insertInOrder(Iterable<int> numbersToInsert) {
return h
.insertInOrderNums(
numbersToInsert: numbersToInsert,
original: this,
)
.toSet();
}