2665-counter2

2665. Counter II (?) (https://leetcode.com/problems/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.

function createCounter(init: number): Counter {
  let value = init
 
  return {
    increment: () => ++value,
    decrement: () => --value,
    reset: () => (value = init),
  }
};

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
 
  Example 2:
 
    Input: init = 0, calls = ["increment","increment","decrement","reset","reset"]
    Output: [1,2,1,0,0]
    Explanation:
    const counter = createCounter(0);
    counter.increment(); // 1
    counter.increment(); // 2
    counter.decrement(); // 1
    counter.reset(); // 0
    counter.reset(); // 0