callApply.js

// Hazrat Ali
// University Of Scholars
const normalPerson = {
    firstName: 'Rahim',
    lastName: 'Uddin',
    salary: 15000,
    getFullName: function(){
        console.log(this.firstName, this.lastName);
    },
    chargeBill: function(amount, tips, tax){
        console.log(this);
        this.salary = this.salary - amount - tips - tax;
        return this.salary;
    }
}
// call apply js
const heroPerson = {
    firstName: 'Hero',
    lastName: 'Balam',
    salary:25000
}

const friendlyPerson = {
    firstName: 'Hero',
    lastName: 'Golam',
    salary:25000
}

normalPerson.chargeBill();

const heroChargeBill = normalPerson.chargeBill.bind(heroPerson);
heroChargeBill(2000);
heroChargeBill(3000);
console.log(heroPerson.salary);
console.log(normalPerson.salary);


const friendlyChargeBill = normalPerson.chargeBill.bind(friendlyPerson);
friendlyChargeBill(1500);

normalPerson.chargeBill.call(heroPerson, 900, 100, 10);
normalPerson.chargeBill.call(heroPerson, 3000, 300, 30);
console.log(heroPerson.salary);

normalPerson.chargeBill.call(friendlyPerson, 5000, 500, 50);
console.log(friendlyPerson.salary);
console.log(normalPerson.salary);

normalPerson.chargeBill.apply(heroPerson, [3000, 300, 30]);
normalPerson.chargeBill.apply(heroPerson, [4000, 400, 40])
console.log(heroPerson.salary);