Mobile Development and JavaScript | Module 5

Course Name: Mobile Development and JavaScript

Course Link: Mobile Development and JavaScript

These are Mobile Development and JavaScript Week 5 Coursera Answers

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Programming Assignment: Little Lemon Receipt Maker

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These are Mobile Development and JavaScript Week 5 Coursera Answers

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Module 5 Quiz: Final Graded Quiz: Programming with JavaScript

Q1. What will be the output of the following JavaScript?

const a = 10; 
const b = 5; 
if(a == 7 || b == 5) {
    console.log("Green"); 
} 
else {
    console.log("Blue"); 
}

• Nothing
• Blue
• syntaxError
• Green

Answer: Green

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Q2. What will be the output of the following JavaScript?

var message = "Hello"; 
message += " World!"; 
message = "Goodbye!"; 
console.log(message);

• Goodbye!
• World!
• Hello
• Hello World!

Answer: Goodbye!

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Q3. What will be the output of the following JavaScript?

var x = true;
x = 23; 
console.log(x);

• undefined
• true
• rangeError
• 23

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These are Mobile Development and JavaScript Week 5 Coursera Answers

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Q4. What is the data type of the x variable in the following code?
var x = “Hello”;

• BigInt
• Number
• String
• Boolean

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Q5. What is the data type of the x variable in the following code?
var x = 0 != 1;

• String
• BigInt
• Number
• Boolean

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Q6. What is the data type of the x variable in the following code?
var x = 23.2;

• Boolean
• Number
• String
• BigInt

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These are Mobile Development and JavaScript Week 5 Coursera Answers

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Q7. What will the following JavaScript code output?

var x = 20; 
if(x >= 10) {
    console.log("Apple"); 
    } 
else if(x <= 5) {
    console.log("Pear"); 
    } 
else { console.log("Orange"); }

• undefined
• Orange
• Apple
• Pear

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Q8. What will the following JavaScript code output?

var x = 10; 
if(x > 10) {
     console.log("Apple"); 
     } 
else if(x > 5) { 
     console.log("Pear"); 
     } 
else {
     console.log("Orange");  
     }

• Pear
• Orange
• undefined
• Apple

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Q9. What will the following JavaScript code output?

var result = 0; 
var i = 0; 
var limit = 3; 
while(i < limit) {
    result += 2; i++; 
} 
console.log(result);

• 2
• 6
• 3
• 0

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These are Mobile Development and JavaScript Week 5 Coursera Answers

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Q10. What will the following JavaScript code output?

var result = 0; 
var i = 4; 
while(i > 0) {
    result += 2; i--; 
} 
console.log(result);

• 8
• 4
• 2
• 0

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Q11. When the following code runs, what will print out?
try { throw new Error(); console.log(‘Square’); }
catch(err) { console.log(‘Circle’); }

• Circle
• undefined
• sytaxError
• Square

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Q12. What will the following JavaScript code output?
console.log(result);
var result = 7;

• 7
• null
• undefined
• result()

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These are Mobile Development and JavaScript Week 5 Coursera Answers

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Q13. What’s missing from this JavaScript function declaration?
function(a,b) 
{ return a + b } 

• The function name.
• The assignment operator.
• The dot notation.
• The bracket notation.

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Q14. In the following JavaScript code snippet, what is missing for the code to return the value 15?
function addTwo(a,b) { return a }
addTwo(5,10)

• Attribute
• Bracket notation
• +b in the return statement.

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Q15. What is the output of the code below?

var cat = {} 
cat["sound"] = "meow"; 
var catSound = "purr";
console.log(cat.sound)

• catSound
• meow
• {}
• purr

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These are Mobile Development and JavaScript Week 5 Coursera Answers

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Q16. What is the output of the code below?

var cat = {} 
cat.sound = "meow"; 
var catSound = "purr" 
console.log(catSound)

• {}
• purr
• catSound
• meow

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Q17. True or False: The pop method will remove the last item in an array.

• True
• False

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Q18. True or False: The second argument passed to the addEventListener function is the function that handles the event when triggered.

• False
• True

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These are Mobile Development and JavaScript Week 5 Coursera Answers

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Q19. What is the first argument passed to the addEventListener function?

• A string describing the type of event (such as, ‘click’).
• A function that will handle the event.
• The name of the method.
• The target of the event.

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Q20. How do you create a new h2 element using JavaScript?

• With document.addElement(‘h2’)
• With document.createElement(‘h2’)
• With document.buildElement(‘h2’)

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Q21. What does this line of code do?
document.createElement(‘h2’).innerText = “Heading Level 2”

• It adds an inner-text HTML attribute to the h2 element.
• This syntax is invalid.
• It adds “Heading level 2” to the innerText class.
• It creates an h2 element without adding it to the page.

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These are Mobile Development and JavaScript Week 5 Coursera Answers

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Q22. What does this code do?
function addFive(val) { return val + 5; }; 
module.exports = addFive; 

• It defines the addFive function and exports it as a Node module so that it can be used in other files.
• It allows you to invoke the addFive function without the parentheses.
• This syntax is invalid.
• It allows you to invoke the addFive function without writing unnecessary code.

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Q23. What part of the following code should be changed for the code to run correctly.
const addFive = require(‘./addFive.js’)

• .js should be replaced with .node.
• addFive should be a function.
• (‘./addFive.js’) should be in brackets.
• .js is unnecessary after addFive.

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Q24. DevTools console is frequently used to perform what function?

• Testing your code.
• Installing npm.
• Downloading packages.
• Running Javascript in a web browser.

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These are Mobile Development and JavaScript Week 5 Coursera Answers

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Q25. What web browser tool can you use to run Javascript?

• GUI
• console.log
• Package manager
• DevTools Console

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Q26. /* Comment */ is used to indicate which of the following information types in Javascript?

• unfinished code
• multi-line comments
• inline comments
• test code

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Q27. Which of the following comments is the correct syntax for an inline comment?

• // Comment 2
• \ Comment 1
• ## ## Comment 3 ##
• /* * Comment 4 */

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These are Mobile Development and JavaScript Week 5 Coursera Answers

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Q28. Which of the following selections is not a data type?

• booleans
• numbers
• function
• string

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Q29. Which data type is used to store a true or false value?

• function
• numbers
• booleans
• string

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Q30. Which data type is used to store the value “Welcome to Javascript!”?

• numbers
• booleans
• function
• string

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These are Mobile Development and JavaScript Week 5 Coursera Answers

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Q31. Which statement describes the difference between == and ===?

• == is used for numbers and === is used for strings.
• == operator compares the values as well as the data types of the operands.
• === operator compares the values as well as the data types of the operands and == symbol is used to assign variables.
• There is no difference between == and ===.

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Q32. What is unit testing?

• Unit testing gives you an efficiency rating for your code measured in units.
• Unit testing tries to imitate how a user might interact with your app.
• Unit testing revolves around the idea of having separate, small pieces of code that are easy to test.
• Unit testing is testing how parts of your system interact with other parts of our system.

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Q33. Having separate, small pieces of code that are easy to test describes what type of testing?

• Unit testing
• Integration testing
• End-to-end testing
• Post-hoc testing

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These are Mobile Development and JavaScript Week 5 Coursera Answers

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Q34. True or False: End-to-end testing is the fastest and least expensive type of testing.

• False
• True.

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Q35. Which statement best describes End-to-end testing (e2e)?

• End-to-end testing revolves around the idea of having separate, small pieces of code that are easy to test.
• End-to-end testing is a comprehensive test that starts at the beginning of your code and runs to the end.
• End-to-end testing tries to imitate how a user might interact with your application.
• End-to-end testing is testing how parts of your system interact with other parts of our system.

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Q36. True or False: You can install packages from the npm repository using the node command.

• True
• False

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These are Mobile Development and JavaScript Week 5 Coursera Answers

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Q37. Which statement best describes the function of package.json?

• Turn your code into an application.
• Download npm packages.
• Store all the dependencies required for application.
• Store all the testing code.

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Q38. True or False: If you build a project with multiple node packages, they will all be listed inside the package.json file.

• True
• False

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Q39. Which feature is used to mock data in Javascript?

• Jest Snapshot
• Jest Fakes
• Jest Mock functions
• External mock libraries

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These are Mobile Development and JavaScript Week 5 Coursera Answers

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Q40. Which statement does not describe the process of mocking?

• You can test the front end functionality of your web app by mocking the data as if it came back from a server.
• Mocking is a substitute for testing.
• Mocks allow you to pretend that users are already there if the backend hasn’t been built yet.
• Mocking allows you to separate the code that you are testing from its related dependencies.

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Q41. True or False: End-to-end tests can be performed in a web browser without writing code.

• False
• True

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Q42. Which of the following variable declarations cannot be redeclared or reassigned?

• There are no variable declarations which cannot be reassigned.
• const
• var
• let

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These are Mobile Development and JavaScript Week 5 Coursera Answers

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Q43. Which of the following variable declarations cannot be redeclared but can be reassigned?

• let
• const
• There are no variable declarations which cannot be redeclared but can be reassigned.
• var

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Q44. What will print out when the following code runs?

class Game {
    constructor(score) {this.score = points; } 
    getPoints() { return this.score; }
}
class Bonus extends Game {
    constructor() { super(2);} 
    getpoints() { return super.getPoints() * 5; } 
} 
var result = new Bonus(); 
console.log(result.getPoints()); 

• 2
• 0
• 10
• 5

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Q45. What is the function of extends in the following code block.

class Animal { } 
class Cat extends Animal { 
    constructor() { this.noise = "meow"; } 
    makeNoise() { return this.noise; } 
} 
class Tiger extends Cat { 
    constructor() { super(); this.noise = "growl"; } 
} 
var result = new Tiger(); 
console.log(result.makeNoise());

• Creates a parent of the class Animal.
• Replaces the class Animal with the class Cat.
• Replaces the class Cat with the class Tiger.
• Creates a child Cat of the class Animal and a child Tiger of the class Cat.

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These are Mobile Development and JavaScript Week 5 Coursera Answers

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Q46. What will print out when the following code runs?

class Animal { } 
class Cat extends Animal { 
    constructor() { this.noise = "meow"; } 
    makeNoise() { return this.noise; } 
} 
class Tiger extends Cat { 
    constructor() { super(); this.noise = "growl"; } 
} 
var result = new Tiger(); 
console.log(result.makeNoise());

• syntaxError
• growl
• undefined
• meow

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Q47. console.log(…rest) will output which of the following for the below statement?
const [a, b, …rest] = [1,2,3,4]

• undefined
• 1
• [3,4]
• 2

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Q48. Which statement will log [3,4] to the console from the following code snippet?
let a, b, rest;
[a, b, …rest] = [1,2,3,4]

• console.log(…rest)
• console.log(rest)
• console.log(c+d)
• console.log(c,d)

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These are Mobile Development and JavaScript Week 5 Coursera Answers

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Q49. True or false: The rest parameter syntax allows a function to accept an indefinite number of arguments as an array.

• True
• False

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Q50. What value will be printed out when the following code runs?

function count(...food) 
{ console.log(food.length) } 
count("Burgers", "Fries", null);

• “Burgers”, “Fries”, null
• 2
• 3
• “Burgers”, “Fries”, undefined

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Q51. JSON.parse is a static method used to do which of the following?

• Convert a JavaScript object to a JSON string.
• Convert a JSON string to a JavaScript object.
• Convert a JavaScript object to a JSON number.
• Convert a JavaScript object to a JSON boolean.

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These are Mobile Development and JavaScript Week 5 Coursera Answers

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Q52. Which of the following static methods convert a JSON string into an object?

• JSON.parse
• JSON.stringify
• JSON.fromString
• JSON.toString

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Q53. A function that is called to create an instance of an object is called what?

• Constructor
• Method
• An object literal
• Argument

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These are Mobile Development and JavaScript Week 5 Coursera Answers

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Q54. What keyword, used with a constructor function, details how an object will be built?

• Extends
• New
• Construct
• Function

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These are Mobile Development and JavaScript Week 5 Coursera Answers

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Q55. The Object Oriented Programming paradigm can best be described how?

• It works by writing efficient code.
• It works by keeping data in meaningful objects but keeps functionality separate.
• It works by keeping the data and functionality grouped in meaningful objects.
• It works by keeping the data and functionality separate.

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These are Mobile Development and JavaScript Week 5 Coursera Answers

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Q56. Which of the following concepts are not associated with the concept of functional programming?

• Higher-order function
• First-class functions
• Pure functions and side-effects
• Objects

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These are Mobile Development and JavaScript Week 5 Coursera Answers

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Q57. The Functional Programming paradigm can best be described how?

• It works by writing efficient code.
• It works by keeping the data and functionality separate.
• It works by keeping data in meaningful objects but keeps functionality separate.
• It works by keeping the data and functionality grouped in meaningful objects.

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These are Mobile Development and JavaScript Week 5 Coursera Answers

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