functions are object in javascript?

Question

var obj = {};
var fn = function(){};
obj.prop = "some value";
fn.prop = "some value";
assert( obj.prop == fn.prop, "Both are objects, both have the property." );
assert(typeof(obj) === 'object', "Yes its an object");
assert(typeof(fn) === 'object', "why is this not an object");

I heard from some people around that functions are objects and this is what i am believing so far, but why is the first condition passes well and third one fails.

Yes, yes they are. Now, what is the result of typeof fn? — user166390
– user166390, Commented Dec 27, 2012 at 0:09

Ja͢ck · Accepted Answer · 2012-12-27 00:21:19Z

8

That's because the direct type of a function is "function".

However, you missed this assertion:

fn instanceof Object // true

Btw, types such as "number" and "string" are strictly not descendants of Object, even though they are like objects in the sense that they have methods; just one of those things that makes JavaScript interesting :)

See also: typeof and its range of values.

edited Dec 27, 2012 at 0:21

answered Dec 27, 2012 at 0:10

Ja͢ck

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cdhowie · Accepted Answer · 2012-12-27 00:09:35Z

8

Functions are objects, but they are a particular type of object. typeof(fn) should evaluate to "function", which is a sub-type of "object".

answered Dec 27, 2012 at 0:09

cdhowie

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