Method Updates

Update an instance field inside a method.

method_update.js

const start = 10;
class Score {
  constructor(start) {
    this.value = start;
  }

  add(points) {
    this.value = this.value + points;
    return this.value;
  }
}

const next = new Score(start).add(5);

console.log("start=" + start);
console.log("next=" + next);

method-update Methods can update fields through `this`. Keep the update small and return the new value when callers need it immediately.