How to handle empty object in if statement as false?

Question

I ran across this case today

if ({}) {
  // This is returned as empty object is true
}

therefore need to figure out a way where {} is false, tried calling .length on an object I pass to the if statement, but that doesn't work.

I'm not sure what you're asking. If you want to find out if an object has no properties, use `Object.keys`. — John Dvorak, Jul 04 '16 at 11:16
You sort of have to define what "empty object" means. That is has no `own` keys...? — deceze, Jul 04 '16 at 11:16

score 8 · Accepted Answer · answered Jul 04 '16 at 11:17

You can use Object.keys() method to achieve this.

From Mozilla's Documentation:

The Object.keys() method returns an array of a given object's own enumerable properties, in the same order as that provided by a for...in loop (the difference being that a for-in loop enumerates properties in the prototype chain as well).

if (Object.keys({}).length) {
  console.log('Object is not Empty');
} else {
  console.log('Object is Empty');
}

console.log(Object.keys({}).length);

score 2 · Answer 2 · answered Jul 04 '16 at 11:16

2

You can try to use:

Object.keys(obj).length === 0;

answered Jul 04 '16 at 11:16

Rahul Tripathi

161,154
30
262
319

You need to check for `Symbol`s too – Jul 04 '16 at 11:21

How to handle empty object in if statement as false?

2 Answers2