counter-ii.js

/*
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
*/

//solution:

var createCounter = function(init) {
    let cnt = init;
    return{
        increment: () => cnt+=1, decrement: () => cnt-=1, reset: () => (cnt=init),
    }
};