2665. 计数器 II - 闭包

Problem: 2665. 计数器 II

/**
 * @param {integer} init
 * @return { increment: Function, decrement: Function, reset: Function }
 */
var createCounter = function(init) {
    return{
        initialVal:init,
        value:init,
        increment: function () {
            this.value++
            return this.value 
        },
        decrement: function (){
            this.value--
            return this.value
        },
        reset: function (){
            this.value=this.initialVal
            return this.value
        }
    }
};

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

/**
 * @param {integer} init
 * @return { increment: Function, decrement: Function, reset: Function }
 */
var createCounter = function (init) {
    const ret = {
        initialVal: init,
        value: init,
        increment: function () {
            return ++this.value
        },
        decrement: function () {
            return --this.value
        },
        reset: function () {
            return this.value = this.initialVal
        }
    }
    return ret;
};

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