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JS Functions

In this example the fulllName method of person is applied on person1:

const person = {
  fullName: function(city, country) {
    return this.firstName + " " + this.lastName + "," + city + "," + country;
  }
};

const person1 = {
  firstName:"John",
  lastName: "Doe"
};

document.getElementById("demo").innerHTML = person.fullName.apply(person1, ["Oslo", "Norway"]);