initial public commit

1 files changed, 17 insertions, 0 deletions

diff --git a/util/array.ts b/util/array.ts
new file mode 100644
index 0000000..76e2a9e
--- /dev/null
+++ b/util/array.ts
@@ -0,0 +1,17 @@
+declare global {
+	interface Array<T> {
+		anyOf(arr2: Array<T>): boolean;
+		peek(): T;
+	}
+}
+
+/** @summary check if any of the elements of `arr2` are included in `this` */
+Array.prototype.anyOf = function(arr2) {
+	return !!this.filter(e => arr2.includes(e)).length;
+};
+
+/** @summary return last element of array without removing it */
+Array.prototype.peek = function() {
+	return this[this.length - 1];
+};
+