Learn AI Create the Future — with Pranay
Main site

LeetCode solutions

2789. Counter II

My accepted JavaScript solution to LeetCode problem 2789, Counter II, running in 40ms.

  • Difficulty: Easy
  • JavaScript
  • Runtime 40ms
  • Memory 57.5MB

Read the problem on LeetCode View on GitHub

The problem statement is LeetCode’s and stays on their site. What follows is my accepted solution.

JavaScript

Accepted on LeetCode — runtime 40ms, memory 57.5MB, accepted 2025-12-31.

javascript
/**
 * @param {integer} init
 * @return { increment: Function, decrement: Function, reset: Function }
 */
var createCounter = function(init) {
    let current = init;
    return {
        increment: function() {
            return ++current;
        },
        decrement: function() {
            return --current;
        },
        reset: function() {
            current = init;
            return current;
        }
    };
};

/**
 * const counter = createCounter(5)
 * counter.increment(); // 6
 * counter.reset(); // 5
 * counter.decrement(); // 4
 */

Source