closureFactory.js

function Engine() {
    let self = {running: false, radius: 15};
    return function (msg) {
        if (msg === 'turnOn') {
            self.running = true;
        } else if (msg === 'turnOff') {
            self.running = false;
        } else if (msg === 'setRadius') {
            self.radius = parseInt(arguments[1], 10);
        } else if (msg === 'turnOff') {
            self.running = false;
        } else if (msg === 'printStatus') {
            console.log(`STATUS: Engine is ${self.running ? 'on' : 'off'} and radius is ${self.radius}`);
        } else {
            throw `Invalid method ${msg}`
        }
    }
}


engine1 = Engine()
engine1('printStatus')
engine1('turnOn')
engine1('printStatus')
engine1('turnOff')
engine1('printStatus')
engine1('setRadius', 100)
engine1('printStatus')

Should output something like

STATUS: Engine is off and radius is 15
STATUS: Engine is on and radius is 15
STATUS: Engine is off and radius is 15
STATUS: Engine is off and radius is 100