Create insertAt.js

lgope · web-flow · commit c094155fbf68 · 2021-11-24T12:09:45.000+06:00
diff --git a/js-coding-technique/insertAt.js b/js-coding-technique/insertAt.js
@@ -0,0 +1,15 @@
+// Insert an item into an array at a specific index (Immutable insertion)
+/**
+ * 
+ * @param {Array} arr
+ * @param {Int} index 
+ * @param {*} values 
+ * @returns arr {New Array}
+ * 
+ * @demo let bar = insertAt(arr, 2, 'a', 'b')
+ */
+export const insertAt = (arr, index) => {
+	const items = Array.prototype.slice.call(arguments, 2);
+
+	return [].concat(arr.slice(0, index), items, arr.slice(index));
+};
