Javascript Constants in ES6

Question

What would be the preferred way to create constants in javascript, specifically with ES6?

Currently I have a constants class which has methods that return the string I'm looking for.

 class Constants {
 constructor() {}
 SOMECONSTANT() {
 return 'someconstant';
 }
 }

• gnat: see Are there any OO-principles that are practically applicable for Javascript?

Answer 1

For backwards compatibility, I would create a read-only property of the encapsulating object, which could be the global object:

Object.defineProperty(this, 'CONST', {
 value: 123,
 writable: false
});

See: Object.defineProperty - writable attribute

Otherwise, ES6 has a const keyword.

const name1 = value1 [, name2 = value2 [, ... [, nameN = valueN]]];

See const.

• Beanwah: My understanding with the const keyword is that it can only be used in local scope. I should have clarified I need the constants scoped globally.
• svidgen: Local or global. It's block scoped, I think.