How to use const keyword (ecma 6) with function static variable in javascript

Question

I have a JavaScript function which has a static variable:

function Constants() {

}

Constants.i = '1';

Now according to ECMA 6 we have const keyword. Using this we can make a variable as immutable.

I am not able to find how to use const keyword with function static variable, if I use like below it is not loading the function:

const Constant.i = '1';

It will be very helpful if anyone can suggest the proper way of doing the same.

There are no static variables in JavaScript. What you have is a property. There are ways to make it non-writable, but not using a keyword or declaration like const. — Bergi
– Bergi, Commented Mar 2, 2016 at 11:54
const Constant.i = '1'; it will raise an error. Probably it will help you Object.defineProperty — The Reason
– The Reason, Commented Mar 2, 2016 at 11:55
const is not making a variable immutable, it just makes sure the reference to the value won't change. — Oliver
– Oliver, Commented Mar 2, 2016 at 12:01

nils · Accepted Answer · 2016-03-02 12:24:11Z

1

const only works for variables, not for object (or function) properties.

As mentioned above, you can use Object.defineProperty to define an object property that cannot be changed:

function Constants() {

}

Object.defineProperty(Constants, 'i', {
    value: '1',
    writable: false, // this prevents the property from being changed
    enumerable: true, // this way, it shows up if you loop through the properties of Constants
    configurable: false // this prevents the property from being deleted
});

answered Mar 2, 2016 at 12:24

nils

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