2620-counter.js

/**
 * 2620. Counter
 * https://leetcode.com/problems/counter/
 * Difficulty: Easy
 *
 * 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).
 */

/**
 * @param {number} n
 * @return {Function} counter
 */
var createCounter = function(n) {
  let count = n;
  return () => count++;
};