CODEWITHSUNDEEP
javascriptoopprototypeprototypal-inheritance
sunny
sunny

Reputation: 125

Waiting for other function to end in constructor function

I have this type of constructor of Child. Function play has to decrement hunger and increment fun after every second for the time, that is put as a parameter. If either the fun is 10 or the hunger is 1, it has to stop. Function need has to return CURRENT fun and hunger. I have a problem how to do it if I want to wait for play() if there is any pending, like in my code. Could you help? Parameter in play determines how many seconds the child plays - so e.g. if there is 3, the fun will increase +3

function Person(firstName, lastName, age, type, hunger) {
    this.firstName = firstName;
    this.lastName = lastName;
    this.age = age;
    this.type = type;
    this.hunger = hunger;
}

function Child(firstName, lastName, age, type, hunger) {
    Person.call(this, firstName, lastName, age, type, hunger)
    this.fun = 5
}
Child.prototype = Object.create(Person.prototype)
    Child.prototype.constructor = Child

    Child.prototype.play = async function (sec) {

    const interval = setInterval(() => {
        if (this.fun >= 10 || this.hunger <= 1) {
            clearInterval(interval)
        } else {
            this.fun += 1
            this.hunger -= 1
        }
    }, 1000)

        setTimeout(() => clearInterval(interval), sec * 1000)
}
Child.prototype.need = async function () {
    await this.play()
    return "Fun: " + this.fun + " , hunger: " + this.hunger
}

const child1 = new Child("child1", "childdddd", 3, 'boy', 4)

child1.play(3)

console.log(child1.need())

Upvotes: 1

Views: 64

Answers (1)

Guerric P
Guerric P

Reputation: 31815

Your code works perfectly, but the async functions return a Promise, so you have to either:

  • Provide a callback in then
  • await it

function Person(firstName, lastName, age, type, hunger) {
    this.firstName = firstName;
    this.lastName = lastName;
    this.age = age;
    this.type = type;
    this.hunger = hunger;
}

function Child(firstName, lastName, age, type, hunger) {
    Person.call(this, firstName, lastName, age, type, hunger)
    this.fun = 5
}
Child.prototype = Object.create(Person.prototype)
Child.prototype.constructor = Child

Child.prototype.play = function (sec) {
    this.result = new Promise(resolve => {
        const interval = setInterval(() => {
            if (this.fun >= 10 || this.hunger <= 1) {
                end();
            } else {
                this.fun += 1
                this.hunger -= 1
            }
        }, 1000)
        
        setTimeout(end, sec * 1000)
        
        function end() {
            clearInterval(interval)
            resolve()
        }
    })
}
Child.prototype.need = async function () {
    await this.result;
    return "Fun: " + this.fun + " , hunger: " + this.hunger
}

const child1 = new Child("child1", "childdddd", 3, 'boy', 4)

child1.play(3)

child1.need().then(console.log);

Upvotes: 2

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