BitMask Demo

bitmask.js

let CUTE = 1
let ANGRY = 2
let HUNGRY = 4

let CAT = ANGRY | HUNGRY
// angry only would be: let CAT = ANGRY
// cute, angry and hungry would be: let CAT = CUTE | ANGRY | HUNGRY

if (CAT & HUNGRY) {
  console.log('Yeah my cat is hungry')
  if (CAT & ANGRY) {
    console.log('And he\'s angry')
    if (CAT & CUTE) {
      console.log('But it doesn\'t matter because he\'s cute')
    }
  }
}