Objects and Properties

Methods and This

Call an object method that reads another property.

Methods and This

methods_this.js 
const step = 3;
const next = ({
  start: 10,
  add(n) {
    return this.start + n;
  }
}).add(step);

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

Call the Method

  1. The object stores start: 10.
  2. step is 3.
  3. Calling .add(step) runs the method on that object.
  4. Inside the method, this.start is 10.
  5. The returned value is 13.
this.start 10 + step 3 -> 13
methods-this When a function is called as an object method, `this` refers to that object for the duration of the call.

Exercise: methods_this.js

Call an object method that uses this.start and prints the next value