errorContinued.js

class Master {
    tenThousandHours(sweat) {
      this.sweat = sweat;
  }
 
  grind() {
    console.log(this.sweat);
  }
}

const yoda = new Master(); 
yoda.tenThousandHours('sweaty, knees weak, arms are heavy'); 

yoda.grind(); 
const grind  = yoda.grind;
grind();