countertwo

Author: nilajcoder

Programs/Exercise/countertwo.js

@@ -0,0 +1,57 @@
+/*
+
+ Counter II
+
+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.
+ 
+
+Example 1:
+
+Input: init = 5, calls = ["increment","reset","decrement"]
+Output: [6,5,4]
+Explanation:
+const counter = createCounter(5);
+counter.increment(); // 6
+counter.reset(); // 5
+counter.decrement(); // 4
+*/
+
+var createCounter = function (init) {
+
+    let current = init
+    // return an object
+    return {
+
+        increment: () => {
+
+            return ++current
+
+        },
+
+        decrement: () => {
+            return --current
+        },
+
+        reset: () => {
+            current = init
+            return current
+        }
+    }
+
+
+};
+
+
+const counter = createCounter(5)
+console.log(counter.increment()); // 6
+console.log(counter.increment()); // 7
+console.log(counter.decrement()); // 6
+console.log(counter.reset());     // 5
+console.log(counter.decrement()); // 4