State machine

stateMachine.js

const machine = {
  initial: 'inactive',
  states: {
    inactive: {
      on: {
        TOGGLE: 'active',
      }
    },
    active: {
      on: {
        TOGGLE: 'inactive'
      }
    }
  }
}

function transition(state, event) {
  return machine.states[state]?.on?.[event] || state;
}

function toggleState(initialState) {
  let currentState = initialState;
  return (event) => {
    currentState = transition(currentState, event);
    console.log({ currentState });
  } 
}

const send = toggleState('inactive');
send('TOGGLE');
send('TOGGLE');