Object.create in NodeJS

Question

Object.create works differently in Nodejs compared to FireFox.

Assume an object like so:

objDef = {
  prop1: "Property 1"
}

obj = {
  prop2: "Property 2"
}

var testObj = Object.create(obj, objDef);

The above javascript works perfectly in Mozilla. It basically uses the second argument passed to Object.create to set default values.

But this does not work in Node. The error I get is TypeError: Property description must be an object: true.

How can I get this to work in Node? I want to basically create an Object with a default value.

jmc · Accepted Answer · 2013-01-13 03:19:04Z

7

The second parameter should map property names to property descriptors, which are to be objects.

See the example shown at the MDN:

You could solve by using something like this:

objDef = {
    prop1: {
        value: "Property 1"
    }
}

answered Jan 13, 2013 at 3:19

jmc

5383 silver badges11 bronze badges

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

Comments

Sly_cardinal · Accepted Answer · 2013-01-13 03:22:19Z

6

The second parameter to Object.create(proto [, propertiesObject ]) should be a property descriptor object

This will create a property with a default value that can be both enumerated and modified:

Object.create(obj, {
    prop1: {
        configurable:true,
        enumerable:true,
        value:"Property 1",
        writable: true
    }
}

answered Jan 13, 2013 at 3:22

Sly_cardinal

13.3k5 gold badges53 silver badges55 bronze badges

Shiva K · Accepted Answer · 2013-02-03 16:50:59Z

0

Object.prototype.test = 0;

will set the default value of test key in any object to 0.

answered Feb 3, 2013 at 16:50

Shiva K

872 bronze badges