initial public commit

1 files changed, 17 insertions, 0 deletions

diff --git a/util/set.ts b/util/set.ts
new file mode 100644
index 0000000..9790682
--- /dev/null
+++ b/util/set.ts
@@ -0,0 +1,17 @@
+declare global {
+	interface Set<T> {
+		anyOf(arr2: Array<T>): boolean;
+		arr(): Array<T>;
+	}
+}
+
+/** @summary return set items as array */
+Set.prototype.arr = function() {
+	return Array.from(this);
+}
+
+/** @summary check if any of the elements of `arr2` are included in `this` */
+Set.prototype.anyOf = function(arr2) {
+	return !!this.arr().filter(e => arr2.includes(e)).length;
+};
+