lazyMan

题目

实现一个LazyMan，可以按照以下方式调用:
LazyMan(“Hank”)输出:
Hi! This is Hank!
LazyMan(“Hank”).sleep(10).eat(“dinner”)输出
Hi! This is Hank!
//等待10秒..
Wake up after 10
Eat dinner~
LazyMan(“Hank”).eat(“dinner”).eat(“supper”)输出
Hi This is Hank!
Eat dinner~
Eat supper~
LazyMan(“Hank”).sleepFirst(5).eat(“supper”)输出
//等待5秒
Wake up after 5
Hi This is Hank!
Eat supper
以此类推。

简单实现

function lazyman(name) {
    return new lazyman.fn.init(name);
}

lazyman.fn = lazyman.prototype = {
    construct: lazyman,
    stack: null,
    status: 0,
    init: function (name) {
        this.name = name;
        this.stack = [];

        return this;
    },
    sleep: function (time) {
        var that = this;
        time = +time;
        if(time !== time) {
            this.next();
        } else if(this.status) {
            this.stack.unshift(this.sleep.bind(this, time));
        } else {
            this.status = 1;
            this.print(`sleeping ${time} seconds...`);

            setTimeout(function () {
                that.status = 0;
                that.next();
            }, time * 1000);
        }
        return this;
    },
    next: function () {
        while(this.status == 0 && this.stack.length) {
            this.print(
                this.stack.pop()()
            );
        }
        return this;
    },
    eat: function(thing) {
        this.stack.unshift(lazyEat.bind(null, this.name, thing));
        if(this.status == 0) {
            this.next();
        }
        return this;
    },
    print: console.log
}

lazyman.fn.init.prototype = lazyman.fn;

function lazyEat(name, thing) {
    return `${name} eat ${thing}`;
}

module.exports = lazyman;