01 const event = new CustomEvent (
02//Missing code
03 );
04 obj.dispatchEvent(event);

const pi = 3.1415926;

01 let car1 = new Promise((_, reject) =>
02   setTimeout(reject, 2000, 'Car 1 crashed in the race'));
03 let car2 = new Promise(resolve => setTimeout(resolve, 1500, 'Car 2 completed'));
04 let car3 = new Promise(resolve => setTimeout(resolve, 3000, 'Car 3 completed'));
05
06 Promise.race([car1, car2, car3])
07   .then(value => {
08     let result = `${value} the race.`;
09   })
10   .catch(err => {
11     console.log('Race is cancelled.', err);
12   });

01 let array = [1, 2, 3, 4, 4, 5, 4, 4];
02 for (let i = 0; i < array.length; i++) {
03   if (array[i] === 4) {
04     array.splice(i, 1);
05     i--;
06   }
07 }

01 function execute() {
02   return new Promise((resolve, reject) => reject());
03 }
04 let promise = execute();
05
06 promise
07   .then(() => console.log('Resolved1'))
08   .then(() => console.log('Resolved2'))
09   .then(() => console.log('Resolved3'))
10   .catch(() => console.log('Rejected'))
11   .then(() => console.log('Resolved4'));

01 function myFunction(reassign) {
02   let x = 1;
03   var y = 1;
04
05   if (reassign) {
06     let x = 2;
07     var y = 2;
08     console.log(x);
09     console.log(y);
10   }
11
12   console.log(x);
13   console.log(y);
14 }

let inArray = [[1, 2], [3, 4, 5]];

01 function Monster() {
02   this.name = 'hello';
03 }
04 const x = Monster();

<input type="text" value="Hello" name="input">
<button type="button">Display</button>

01 const button = document.querySelector('button');
02 button.addEventListener('click', () => {
03   const input = document.querySelector('input');
04   console.log(input.getAttribute('value'));
05 });

01 function changeValue(obj) {
02 obj.value = obj.value / 2;
03 }
04 const objA = { value: 10 };
05 const objB = objA;
06
07 changeValue(objB);
08 const result = objA.value;

01 function Car(maxSpeed, color) {
02   this.maxSpeed = maxSpeed;
03   this.color = color;
04 }
05 let carSpeed = document.getElementById('carSpeed');
06 debugger;
07 let fourWheels = new Car(carSpeed.value, 'red');

01 let total = 10;
02 const interval = setInterval(() => {
03   total++;
04   clearInterval(interval);
05   total++;
06 }, 1000);
07 total++;
08 console.log(total);

01 let country = 1;
02
03 get capital() {
04   let city = Number('London');
05   return {
06     citystring: city.toString()
07   };
08 }