Set 2-1

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Web Development Quiz: Test Your Skills!

Challenge yourself with our comprehensive web development quiz designed to test your knowledge across various topics including JavaScript, APIs, and Node.js.

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10 Questions2 MinutesCreated by CodingGuru312

Refer to the following code:

01 class Ship {

02 constructor(size) {

03 this.size = size;

04 }

05 }

06

07 class FishingBoat extends Ship {

08 constructor(size, capacity) {

09 // Missing code

10 this.capacity = capacity;

11 }

12 displayCapacity() {

13 console.log('The boat has a capacity of $(this.capacity) people.');

14 }

15 }

16

17 let myBoat = new FishingBoad('medium', 10);

18 myBoat.displayCapacity();

Which statement should be added to line 09 for the code to display 'The boat has a capacity of 10 people'?

Super.size = size;

Ship.size = size;

Super(size);

This.size = size;

In the browser, the document object is often used to assign variables that require the broadest scope in an application. Node.js application do not have access to the document object by default.

Which two methods are used to address this?

Choose 2 answers

Assign variables to module.exports and require them as needed

Use the window object instead

Create a new document object in the root file

Assign variables to the global object

A developer is wondering whether to use, Promise.then or Promise.catch, especially when a promise throws an error.

Which two promises are rejected?

Choose 2 answers

Promise.reject('Cool error here').catch(error => console.error(error));

Promise.reject('Cool error here').then(error => console.error(error));

New Promise(() => (throw 'Cool error here')).then((null, error => console.error(error)));

New Promise((resolve, reject) => (throw 'Cool error here')).catch(error => console.error(error));

A developer wants to set up a web server that handles HTTP/2 with Node.js. The developer created a directory locally called app-server, and the first file added is index.js (at app-server/index.js).

Without using any third-party libraries, what should the developer add to line 1 of index.js?

Const http2 = require('http2');

Const server = require('http-2');

Const tls = require('tls');

Const https = require('https');

class Student {

constructor(name) {

this.name = name;

}

takeTest() {

console.log(`$(this.name) got 70% on test.');

}

class BetterStudent extends Student {

constructor(name) {

super(name);

this.name = 'Better student ' + name;

}

takeTest() {

console.log(`$(this.name) got 100% on test.');

}

let student = new BetterStudent('Jackie');

student.takeTest();

What is the console output?

> Uncaught ReferenceError

> Better student Jackie got 70% on test.

> Better student Jackie got 100% on test.

> Jackie got 70% on test.

Refer to the following array:

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

Which three options result in x evaluating as [1, 2]?

Let x = arr.slice(2);

Let x = arr.slice(0, 2);

Let x = arr.filter((a) => { return a<= 2 });

Let x = arr.filter((a) => { a<= 2 });

Let x = arr.splice(0, 2);

Refer to the following code:

01 let obj = {

02 foo: 1;

03 bar: 2;

04 }

05 let output = [];

06

07 for (let something of obj) {

08 output.push(something);

09 }

10

11 console.log(output);

What is the value of output on line 11?

[1, 2]

["foo", "bar"]

["foo:1", "bar:2"]

An error will occur due to the incorrect usage of the for..of statement on line 07.

A developer has two ways to write a function:

Option A:

function Monster() {

this.growl = () => {

console.log("Grr!");

}

Option B:

function Monster() {};

Monster.prototype.growl = () => {

console.log("Grr!");

}

After deciding on an option, the developer creates 1000 monster objects.

How many growl methods are created with Option A and Option B?

1000 growl methods are created for Option A. 1 growl method is created for Option B.

1000 growl methods are created regardless of which option is used.

1 growl method is created for Option A. 1000 growl methods are created for Option B.

1 growl method is created regardless of which option is used.

Refer to the code declarations below:

let str1 = 'Java';

let str2 = 'Script';

Which three expressions return the string JavaScript?

Choose 3 answers

Set 2-1

Web Development Quiz: Test Your Skills!

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