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JS Objects

An object method is a function definition stored as a property value.

If you access it without (), it will return the function definition:

const person = {
  firstName: "John",
  lastName: "Doe",
  id: 5566,
  fullName: function() {
    return this.firstName + " " + this.lastName;
  }
};

document.getElementById("demo").innerHTML = person.fullName;