Can an Object be false?

Question

Is there any way to make an object return false in javascript?

var obj = new Object();

console.log(!!obj) // prints \"true\" even if it\'s empty


        

Answer 1

Object-to-boolean conversions are trivial. All objects (including arrays and functions) convert to true. This is so even for wrapper objects (new Boolean(false)) is an object rather than a primitive value, and so it converts to true.

Answer 2

In your case

console.log(!obj); will return false.

because an object or an empty object is always a truthy.

Answer 3

A null "object" (really value) will return false.

var obj = null;

console.log(!!obj);

If you wanted to check if it has no properties, you might try:

var obj = new Object();
var empty = true;
for (var p in obj) {
    if (obj.hasOwnProperty(p)) {
       empty = false;
       break;
    }
}
console.log(empty);