bitwise permissions example

bitwise.js

// list of permissions
const ADMIN  = 2;
const SEND_MESSAGE = 1;

// my current permission
let myPerms = 0;

console.log(containsPerm(ADMIN))
//addPerm(ADMIN)
addPerm(SEND_MESSAGE)
console.log(containsPerm(ADMIN))
addPerm(ADMIN)
//removePerm(ADMIN)
console.log(containsPerm(ADMIN))
console.log(myPerms)


function removePerm(flag) {
  myPerms = myPerms &= ~flag;
}
function addPerm(flag) {
  myPerms = myPerms | flag;
}
function containsPerm(flag) {
  return myPerms & flag;
}