Add solution #2665

Author: JoshCrozier

README.md

@@ -390,6 +390,7 @@
 2648|[Generate Fibonacci Sequence](./2648-generate-fibonacci-sequence.js)|Easy|
 2649|[Nested Array Generator](./2649-nested-array-generator.js)|Medium|
 2650|[Design Cancellable Function](./2650-design-cancellable-function.js)|Hard|
+2665|[Counter II](./2665-counter-ii.js)|Easy|
 2703|[Return Length of Arguments Passed](./2703-return-length-of-arguments-passed.js)|Easy|
 3110|[Score of a String](./3110-score-of-a-string.js)|Easy|
 3392|[Count Subarrays of Length Three With a Condition](./3392-count-subarrays-of-length-three-with-a-condition.js)|Easy|

solutions/2665-counter-ii.js

@@ -0,0 +1,26 @@
+/**
+ * 2665. Counter II
+ * https://leetcode.com/problems/counter-ii/
+ * Difficulty: Easy
+ *
+ * Write a function createCounter. It should accept an initial integer init.
+ * It should return an object with three functions.
+ *
+ * The three functions are:
+ * - increment() increases the current value by 1 and then returns it.
+ * - decrement() reduces the current value by 1 and then returns it.
+ * - reset() sets the current value to init and then returns it.
+ */
+
+/**
+ * @param {integer} init
+ * @return { increment: Function, decrement: Function, reset: Function }
+ */
+var createCounter = function(init) {
+  let current = init;
+  return {
+    increment: () => ++current,
+    decrement: () => --current,
+    reset: () => current = init,
+  };
+};