JavaScript instanceof

Question

Can you please tell my why in the example below sub instanceof Super is false?

function Super(){
    var obj = {
        prop1: "value1"
    };
    return obj;
}

var sub = new Super();
sub instanceof Super // false

Jamiec · Accepted Answer · 2014-03-13 14:02:59Z

3

Because its not an instance of that type - you've returned an anonymous object. If you would have written it like this:

function Super(){
 this.prop1 = 'value1';   
}

var sub = new Super();
console.log(sub instanceof Super) // true

It would work as intended

answered Mar 13, 2014 at 14:02

Jamiec

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2 Comments

Please be so kind and go into more details with Because its not an instance of that type

@User789 - I did, it's right after the hyphen in that sentence.