call vs apply vs bind

test.js

/* With the call() method, you can write a method that can be used on different objects. */
const person = {
  fullName: function() {
    return this.firstName + " " + this.lastName;
  }
}
const person1 = {
  firstName:"John",
  lastName: "Doe"
}
const person2 = {
  firstName:"Mary",
  lastName: "Doe"
}

// This will return "John Doe":
person.fullName.call(person1);


// can pass arguement 

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

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

person.fullName.call(person1, "Oslo", "Norway");

/* With the apply() method, you can write a method that can be used on different objects. */
// same as call() but can pass array as arguments 

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

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

person.fullName.call(person1, "Oslo", "Norway");

// Math.max.apply(null,[1,2,3])

/* With the bind() method, an object can borrow a method from another object. */
// it will return a new function instead of calling it
const person = {
  firstName:"John",
  lastName: "Doe",
  display: function () {
    let x = document.getElementById("demo");
    x.innerHTML = this.firstName + " " + this.lastName;
  }
}

let display = person.display.bind(person);
setTimeout(display, 3000);