Is there no difference between function and objects in javascript?

Question

In the book Javascript: The good parts the author uses following code to create objects

 if (typeof Object.create !== 'function') {
 Object.create = function (o) {
 var F = function () {};
 F.prototype = o;
 return new F();
 };
 }
 var another_stooge = Object.create(stooge);

The function is meant to create an object but it returns a function instead. (Reference - Chapter 3, Page number : 22)

How are you determining that it returns a function? Because Object.create returns a new instance of the object passed into it. — Heretic Monkey
– Heretic Monkey, Commented May 18, 2016 at 17:39
Just as Marcus said, all functions are objects but not all objects are functions. Objects created with literal syntax are not functions. And now with ES6 we have Class which obviously is not a function. — Rosmarine Popcorn
– Rosmarine Popcorn, Commented May 18, 2016 at 17:44
@MikeMcCaughan Object.creare returns F() which is a function — kartik
– kartik, Commented May 18, 2016 at 17:44
No, it returns new F(). Please read the documentation for Object.create and the new keyword. — Heretic Monkey
– Heretic Monkey, Commented May 18, 2016 at 17:46

Bergi · Accepted Answer · 2016-05-18 18:07:50Z

1

Is there no difference between function and objects in javascript?

Functions are objects that can be called, and they're created with different syntax.

The author uses following code to create objects […]

We should no more. Object.create is standardised and implemented in about every browser.

Anyway, we should not try to understand what Object.create does by looking at this horrible polyfill. We should treat Object.create as a langauge primitive (and we can define the new operator in terms of it if we want).

The function is meant to create an object but it returns a function instead.

No, it doesn't. It does not return F, it does return new F(), which is the result of a call to F (as a constructor).

answered May 18, 2016 at 18:07

Bergi

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