Enums in Javascript with ES6

Question

I\'m rebuilding an old Java project in Javascript, and realized that there\'s no good way to do enums in JS.

The best I can come up with is:

const C         


        

Answer 1

If you don't need pure ES6 and can use Typescript, it has a nice enum:

https://www.typescriptlang.org/docs/handbook/enums.html

Answer 2

Maybe this solution ? :)

function createEnum (array) {
  return Object.freeze(array
    .reduce((obj, item) => {
      if (typeof item === 'string') {
        obj[item.toUpperCase()] = Symbol(item)
      }
      return obj
    }, {}))
}

Example:

createEnum(['red', 'green', 'blue']);

> {RED: Symbol(red), GREEN: Symbol(green), BLUE: Symbol(blue)}

Answer 3

This is my personal approach.

class ColorType {
    static get RED () {
        return "red";
    }

    static get GREEN () {
        return "green";
    }

    static get BLUE () {
        return "blue";
    }
}

// Use case.
const color = Color.create(ColorType.RED);