bitset-example.js

const addState = (initialState, newState) => {
  return initialState | newState;
};

const removeState = (initialState, stateToRemove) => {
  return ~initialState & stateToRemove;
};

const hasState = (initialState, stateToCheck) => {
  return Boolean(initialState & stateToCheck);
};

// Example
const State = {
  HOVERED: 0b01, // One
  FOCUSED: 0b10, // Two
  DISABLED: 0b100, // Four
};

const DEFAULT_STATE = 0b00;

let state = DEFAULT_STATE;
state = addState(state, State.HOVERED); // 0b01
console.log(hasState(state, State.HOVERED)); // true
console.log(hasState(state, State.FOCUSED)); // false

state = removeState(state, State.HOVERED); // 0b00;
console.log(hasState(state, State.HOVERED)); // false