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2665-counter-ii/2665-counter-ii.js

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+/**
+ * @param {integer} init
+ * @return { increment: Function, decrement: Function, reset: Function }
+ */
+var createCounter = function(init) {
+    let count = init;
+
+    return {
+        increment() {
+          count += 1;
+          return count;
+        },
+        decrement() {
+          count -= 1;
+          return count;
+        },
+        reset() {
+          count = init;
+          return count;
+        }
+    };  
+};
+
+/**
+ * const counter = createCounter(5)
+ * counter.increment(); // 6
+ * counter.reset(); // 5
+ * counter.decrement(); // 4
+ */