How to push an object created with ES6 code into an array in javascript

Question

So we have an array of car objects such as time and speed. We want to create a new object using es6 code and then push it into the array. My code returns null

const carPassing = (cars, speed) => {

  class newVehicle {
    constructor(time, speed) {
      this.time = Date.now();
      this.speed = speed;
    }
  }

  console.log(person.time);
  console.log(person.speed);
  cars.push();
  console.log(cars);

  return cars;
};

Also, it's pretty unusual to have a class definition inside a function definition. I think it will work, but it's strange. — Barmar, Nov 16 '19 at 19:57
What is the `time` parameter to the constructor for? You don't use it, you use `Date.now()` as the value in the object. — Barmar, Nov 16 '19 at 19:58
A `class` is like a template for an object, not an object itself. You define the template once, then use the `new` keyword to create instances of the template every time you need one. — Heretic Monkey, Nov 16 '19 at 20:00
It would help someone give you an idea of how to do this if you showed how you are calling the function, what `cars` looks like, and what you are expecting as a result. — Mark, Nov 16 '19 at 20:00
Possible duplicate of [How to add an object to an array](https://stackoverflow.com/questions/6254050/how-to-add-an-object-to-an-array) — Heretic Monkey, Nov 16 '19 at 20:02

score 1 · Accepted Answer · answered Nov 16 '19 at 20:01

You have to create the object with new, then push it onto the array.

class newVehicle {
  constructor(speed) {
    this.time = Date.now();
    this.speed = speed;
  }
}

const carPassing = (cars, speed) => {
  const person = new newVehicle(speed);
  console.log(person.time, person.speed);
  cars.push(person);
  console.log(cars);
  return cars;
};

let allCars = [];
allCars = carPassing(allCars, 100);

score 0 · Answer 2 · answered Nov 16 '19 at 20:04

0

Use Array.push(item)

var car = {time: Date.now(), speed: 60}; 
this.cars.push(car);

OR using spread operator:...

var car = [{time:  Date.now(), speed: 60}];
this.cars.push(...car);

answered Nov 16 '19 at 20:04

junlan

302
1
5

Sarvesh Mahajan · Answer 3 · 2019-11-16T20:27:10.897

Please follow below code, this might be helpful:

enter code here
let carsList = [];
const carPassings = (carsList, speed) => {
class newVehicle {
    constructor(time, speed) {
        this.time = time;
        this.speed = speed;
    }
}
var person = new newVehicle(Date.now(), speed);
console.log(person.time);
console.log(person.speed);
carsList.push({
    person.time,
    person.speed
});
console.log(carsList);
};
carPassings(carsList, 140);

How to push an object created with ES6 code into an array in javascript

3 Answers3