banana.js

class Banana {
  constructor () {
    this.ripeness = 0;
  }

  age() {
    this.ripeness++;
  }

  report() {
    if (this.ripeness === 7) {
      console.log("hmn, delicious");
    } else if (this.ripeness > 7) {
      console.log("brown, unfit for consumption, suitable for muffins");
    } else if (this.ripeness < 7) {
      console.log("ew, crunchy");
    } else {
      console.log("this cannot happen");
    }
  }
}

let b1 = new Banana();
setInterval(b1.age, 1000);
setInterval(b1.report, 1000);