code added

Author: Bharat2044

04_counter2.js

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+// Question Link: https://leetcode.com/problems/counter-ii/?envType=study-plan-v2&envId=30-days-of-javascript
+// Solution Link: https://leetcode.com/problems/counter-ii/solutions/5424118/easty-javascript-solution-using-arrow-function-time-space-complexity-o-1/
+
+/*
+2665. 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
+Example 2:
+Input: init = 0, calls = ["increment","increment","decrement","reset","reset"]
+Output: [1,2,1,0,0]
+Explanation:
+const counter = createCounter(0);
+counter.increment(); // 1
+counter.increment(); // 2
+counter.decrement(); // 1
+counter.reset(); // 0
+counter.reset(); // 0
+ 
+Constraints:
+-1000 <= init <= 1000
+0 <= calls.length <= 1000
+calls[i] is one of "increment", "decrement" and "reset"
+*/
+
+
+
+/**
+ * @param {integer} init
+ * @return { increment: Function, decrement: Function, reset: Function }
+ */
+var createCounter = function(init) {
+    let num = init;
+
+    return {
+        increment: () => {
+            return ++num;
+        },
+        decrement: () => {
+            return --num;
+        },
+        reset: () => {
+            num = init;
+            return num;
+        }
+    }
+};
+
+/**
+ * const counter = createCounter(5)
+ * counter.increment(); // 6
+ * counter.reset(); // 5
+ * counter.decrement(); // 4
+ */