CODEWITHSUNDEEP
javascriptobject
Cracker
Cracker

Reputation: 1768

Is the new operator required in this case to create a new object?

I was going though this presentation http://channel9.msdn.com/Events/MIX/MIX11/FRM08. Steve Anderson used a function having structure similar to the below.

function o(p) {
    return { n: p };
}

To create an object from function o he used 

new o(123)

I guess there is no need of new operator in this case. You can simply write. 

o(123)

What would be the difference in the two ways?

Upvotes: 0

Views: 62

Answers (1)

Guffa
Guffa

Reputation: 700342

The code doesn't make much sense. If the function is used without the new keyword it creates and returns a single object. If it's used with the new keyword, as in the example, two objects are created, and the object created inside the function is discarded.

If you return an object from the function, you should not use the new keyword. A function that is supposed to be used with the new keyword doesn't return an object, instead it uses the this keyword to set properties in the already created object:

function o(p) {
  this.n = p;
}

Upvotes: 2

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