class Rectangle {
  constructor(width, height) {
    this.width = width;
    this.height = height;
  }

  get area() {
    return this.width * this.height;
  }
}

const rectangle = new Rectangle(5, 10);
console.log(rectangle.area());

const obj = { a: 1, b: 2 };
const key = 'c';
console.log(obj[key]);

const promise = new Promise((resolve, reject) => {
  setTimeout(() => {
    resolve('Resolved');
    reject(new Error('Rejected'));
  }, 1000);
});

promise.then(response => console.log(response)).catch(error => console.error(error));

function asyncQuiz() {
  return new Promise((resolve) => {
    setTimeout(() => resolve('Hello'), 1000);
  });
}

async function runAsyncQuiz() {
  const result = await asyncQuiz();
  console.log(result);
}

runAsyncQuiz();
console.log('World');

var a = 1;

function scopeQuiz() {
  console.log(a);
  var a = 2;
}

scopeQuiz();

function delayedLog(item) {
  setTimeout(() => {
    console.log(item);
  }, 1000);
}
for (var i = 0; i < 3; i++) {
  delayedLog(i);
}

var a = 1;

const arrowQuiz = () => {
  console.log(this.a);
};

arrowQuiz();
var a = 2;