copied set implementations from MultiFlag JS

node/src/enumeration/factory.ts

@@ -0,0 +1,24 @@
+import type { EnumerateFlags } from '.'
+
+export function useIterator<S, F>(
+    value: S,
+    IterConstructor: { new (value: S): Iterator<F> }
+): EnumerateFlags<F> {
+    const enumerate = {
+        _value: value,
+
+        [Symbol.iterator]: function () {
+            return new IterConstructor(this._value)
+        },
+
+        forEach: function (callback: (value: F) => void, thisArg?: any) {
+            const iter = new IterConstructor(this._value)
+            let result = iter.next()
+            while (!result.done) {
+                callback.call(thisArg, result.value)
+                result = iter.next()
+            }
+        },
+    }
+    return enumerate as EnumerateFlags<F>
+}