tasks 1..5

//JS1
// порядковый номер среди тегов P
// document.querySelectorAll('p').forEach((element, index) => (element.innerText = index));
// порядковый номер в дереве DOM
document.querySelectorAll('*').forEach((element, index) => {
    if (element.tagName === 'P') {
        element.innerText = index;
    }
});
///////////////////////////////////////////////////////////
//JS2
class Worker {
    constructor(name, surname, rate, days) {
        this.name = name;
        this.surname = surname;
        this.rate = rate;
        this.days = days;
    }

    getSalary() {
        return this.days * this.rate;
    }
}

let worker = new Worker('Иван', "Иванов", 10, 31);
let secondWorker = new Worker('Петр', "Петров", 20, 16);

// console.log(worker.name);
// console.log(worker.surname);
// console.log(worker.rate);
// console.log(worker.days);
// console.log(secondWorker.name);
// console.log(secondWorker.surname);
// console.log(secondWorker.rate);
// console.log(secondWorker.days);

console.log("Total salary of 2 workers: ", worker.getSalary() + secondWorker.getSalary());
////////////////////////////////////////////////////////////////////////////////////////////
//JS3
class MyString {
    reverse(string) {
        return string.split('').reverse().join('');
    }

    ucFirst(string) {
        return string.charAt(0).toUpperCase() + string.substr(1);
    }

    ucWords(string) {
        return string.split(' ').map(word => this.ucFirst(word)).join(' ');
    }
}

var str = new MyString();
console.log(str.reverse('abcde'));
console.log(str.ucFirst('abcde'));
console.log(str.ucWords('abcde abcde abcde'));
//////////////////////////////////////////////////////////////////////////////////////////
//JS4
class User {
    constructor(name, surname) {
        this.name = name;
        this.surname = surname;
    }

    getFullName() {
        return `${this.name} ${this.surname}`;
    }
}


class Student extends User {
    constructor(name, surname, year) {
        super(name, surname);
        this.year = year;
    }

    getCourse() {
        return (new Date()).getFullYear() - this.year;
    }
}


var student = new Student('Иван', "Иванов", 2017);
console.log(student.name);
console.log(student.surname);
console.log(student.getFullName());
console.log(student.year);
console.log(student.getCourse());
//////////////////////////////////////////////////////
//JS5
async function mFetch() {
    await new Promise(res => setTimeout(res, 5000));
    return {
        name: "Maksim"
    }
}

    (async  ()  =>  {
        console.log('start');
          console.time('total');
            console.log(await mFetch());
                console.timeEnd('total');
    })();
///////////////////////////////////////////////////