Counter.js

/* 

Given an integer n, return a counter function. This counter function initially returns n and then returns 1 more than the previous value every subsequent time it is called (n, n + 1, n + 2, etc).

 

Example 1:

Input: 
n = 10 
["call","call","call"]
Output: [10,11,12]
Explanation: 
counter() = 10 // The first time counter() is called, it returns n.
counter() = 11 // Returns 1 more than the previous time.
counter() = 12 // Returns 1 more than the previous time.



Example 2:

Input: 
n = -2
["call","call","call","call","call"]
Output: [-2,-1,0,1,2]
Explanation: counter() initially returns -2. Then increases after each sebsequent call.
 

Constraints:

-1000 <= n <= 1000
0 <= calls.length <= 1000
calls[i] === "call"





/**
 * @param {number} n
 * @return {Function} counter
 */


 var createCounter = function (n) {
    return function () {
          return n++;
    };
};

const counter = createCounter(10)
console.log(counter()); // 10