LeetCode-30-Days-of-JavaScript-Programming/Counter II at main · letsdeepchat/LeetCode-30-Days-of-JavaScript-Programming · GitHub

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/**
 * @param {integer} init
 * @return { increment: Function, decrement: Function, reset: Function }
 */

/* 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

*/
const createCounter = (init) => {
    let presentCounter = init;
    return {
        increment: () => ++presentCounter,
        decrement: () => --presentCounter,
        reset: () => presentCounter = init,
    };
};

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