let str = "Hello, World!";
let result = str.substring(7, 12);
console.log(result);

const a = '10';
const b = 20;
const c = '30.5';

const result = Number(a) + b + Number.parseFloat(c);

console.log(result);

function multiply(a, b = a * 2) {
  return a * b;
}

console.log(multiply(3));

class Vehicle {
  static type() {
    return "Generic Vehicle";
  }
}

class Car extends Vehicle {
  static type() {
    return "Car";
  }
}

console.log(Car.type());

function trickyArgs(a, b, c) {
  arguments[0] = 10;
  arguments[1] = 20;
  arguments[2] = 30;
  console.log(a + b + c);
}
trickyArgs(1, 2, 3);

function* numberGenerator() { 
 for (let i = 0; i < 3; i++) { 
 yield i * 2; 
 } 
} 

const numbers = [...numberGenerator()]; 

console.log(numbers);

function getNextWeekday(dateString) {
    const date = new Date(dateString);
    const day = date.getDay();
    const diff = (day === 0 ? 1 : 8) - day;
    date.setDate(date.getDate() + diff);
    return date.toDateString();
}

console.log(getNextWeekday('2023-10-20'));