#2665 - Counter II

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Problem Description

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.

Solution

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