Added unique array data structure - O(1) addition and retrieval (I think)

unique_array.go

@@ -0,0 +1,28 @@
+package main
+
+// Unique array data structure
+type uniq_arr[T comparable] struct {
+	backingMap map[T]struct{} // Map is used to check if element exists - Empty structs occupy zero memory
+	vals       []T
+}
+
+func new_uniq_arr[T comparable]() uniq_arr[T] {
+	return uniq_arr[T]{
+		make(map[T]struct{}),
+		make([]T, 0),
+	}
+}
+func (s *uniq_arr[T]) add(vals ...T) {
+	for _, item := range vals {
+		if !s.contains(item) {
+			s.backingMap[item] = struct{}{}
+			s.vals = append(s.vals, item)
+		}
+	}
+	return
+}
+
+func (s *uniq_arr[T]) contains(val T) bool {
+	_, ok := s.backingMap[val]
+	return ok
+}