Why I must use "new" while creating object in javascript?

Asked Jul 12 '18 at 18:51

Active Jul 12 '18 at 18:51

Viewed 32 times

I need some help can someone explain me why I mmust use new while creating an object?

I created some objet like this:

var person = {
    firstName: "Danny",
    lastName: "Black",
    age: 20,
    display: function(){
        document.write("My name is " + this.firstName + " " + this.lastName + " and my age is " + this.age);
    }
}

var example = new person.display();
document.getElementById("firstObject").innerHTML = example;

and than like this:

var anotherExample = new person.display();
document.getElementById("firstObject").innerHTML = anotherExample;

what is difference?

asked Jul 12 '18 at 18:51

Danny

2

Calling `new` there doesn't really make any sense. Nobody said you have to use `new`, heck the `person` object you created was not created via `new`. – Andrew Li Jul 12 '18 at 18:52
You don't need `new` to create an object in js. `var x = {a: 2}` is an object, but it doesn't require any special keyword – Christian Vincenzo Traina Jul 12 '18 at 18:53
Yeah, you're skipping the biggest reason to use `new` (non-shared state) – Derek Pollard Jul 12 '18 at 18:53
1

@CristianTraìna the example isn't calling `new` on an object – Derek Pollard Jul 12 '18 at 18:54
2

[See here for a little information](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/new) – Marie Jul 12 '18 at 18:55
ok, lets say I created object without using NEW what the difference ? – Danny Jul 12 '18 at 19:05

Why I must use "new" while creating object in javascript?

0 Answers0