```js

class Robot {
constructor(power) {
    this.power = power;
}

drain() {
    this.power -= 10;
    if (this.power < 0) {
    this.power = 0;
    }
}

shutdown() {
    while (this.power > 0) {
    this.drain();
    }
}
}

let myRobot = new Robot(35);

console.log(myRobot.power); // should print 35

myRobot.shutdown();