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JS Functions

This example calls the fullName method of person, using it on person2:

const person = {
  fullName: function() {
    return this.firstName + " " + this.lastName;
  }
}
const person1 = {
  firstName:"John",
  lastName: "Doe"
}
const person2 = {
  firstName:"Mary",
  lastName: "Doe"
}
document.getElementById("demo").innerHTML = person.fullName.call(person2);