how to check if a javascript object has an instance of a particular object

Question

say i have an array x and a constructor

function Road(footpath,divider,length,lanes){}

and

x[1] = new Road(1,1,1,1);

now how do i determine that x[1] is an object of type Road?

use instanceof like x[1] instanceof Road

mprabhat
– mprabhat

2014-11-25 20:18:30 +00:00
Commented Nov 25, 2014 at 20:18 — mprabhat
– mprabhat, Commented Nov 25, 2014 at 20:18

Renato Gama · Accepted Answer · 2014-11-25 20:18:02Z

4

Simple like this

if(x[1] instanceof Road) {
    //Hey, you have a road!
}

answered Nov 25, 2014 at 20:18

Renato Gama

16.6k12 gold badges64 silver badges98 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

oortcloud_domicile Over a year ago

I tried that but it returns false probably because i add more to it like x[1].children ="Something else"; now if i say x[1] instanceof Road it returns false

Renato Gama Over a year ago

Adding an attribute to your object doesn't seem to be your issue; have a look at a working example: jsbin.com/zikivobese/2/edit

Collectives™ on Stack Overflow

how to check if a javascript object has an instance of a particular object

1 Answer 1

2 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

2 Comments

Your Answer

Sign up or log in

Post as a guest

Related