Javascript Object Methods

// Create an object
let person = {
  firstName: "Elizabeth",
  lastName: "Ollsen",
  id: 5566,
  fullName: function () {
    return this.firstName + " " + this.lastName;
  }
};
 
// Display data from the object:
document.getElementById("demo").innerHTML =
  person.fullName();  // Elizabeth Ollsen
console.log(person);  // {firstName: "Elizabeth", lastName: "Ollsen", id: 5566, fullName: ƒ}