Check that value is object literal?

Question

I have a value and want to know if it\'s an iteratable object literal, before I iterate it.

How do I do that?

Answer 1

I think a function like this should be native, just like Array.isArray:

Object.isObject = function(obj) {
    return obj && obj.constructor === this || false;
};

This one doesn't make function calls nor string comparisons, and doesn't reference global objects (like Object), so it should be quite fast. I don't think this will used in performance intensive tasks though, but whatever.

I'm not totally convinced about the name... maybe something like Object.isLiteral would be better.

It can cause problem with host objects, though, but I don't have a test ready.