A basic JavaScript Enum constructor function

enum.js

// A basic Enum constructor function
const Enum = (...values) => {
  let newEnum = {}
  for (const value of values) {
    Object.assign(newEnum, {
      [value]: value
    })
  }
  return newEnum
}

// Declare a new Enum 
let powerState = Enum("Initial", "On", "Off")
console.log(powerState)  // { Initial: 'Initial', On: 'On', Off: 'Off' }

// Some examples
let state1 = powerState.Initial
let state2 = powerState.On
let currentState = powerState.Initial
state1 === state2  // false
currentState == state1  // true