In javascript should I use const instead of var whenever possible?

Question

If creating a reference to an object, and the reference is not going to change (even though the object will), is it better to use const instead of var?

For example:

Answer 1

If you check MDN, for its reference you can find that its an experimental technology which is part of ES6 proposal. Its browser support is limited.

Reference for const from MDN

This is an experimental technology, part of the Harmony (ECMAScript 6) proposal. Because this technology's specification has not stabilized, check the compatibility table for usage in various browsers. Also note that the syntax and behavior of an experimental technology is subject to change in future version of browsers as the spec changes.

So this answers whether you should use everywhere. :)

Also if you want to create properties in objects which should not be allowed to change, then you should check Object.defineProperties() and the use of writable attribute.