Mobile Development and JavaScript | Coursera Quiz Answers

Coursera: Mobile Development and JavaScript Meta

Mobile Development and JavaScript | Coursera Meta

This course marks the beginning of a series aimed at Android developers seeking to diversify into cross-platform mobile development. It emphasizes leveraging existing Android development skills to create applications that run on multiple platforms. The initial phase focuses on mastering JavaScript programming, a fundamental requirement for utilizing the React library in mobile development.

JavaScript is renowned as the backbone of modern web technology. Participants will delve into essential web development concepts through practical exercises covering functions, objects, arrays, variables, data types, and the HTML DOM, among other key elements. The course also explores advanced interactive capabilities offered by contemporary JavaScript technologies and introduces methodologies for testing code, including hands-on experience in writing unit tests using Jest.

Completion of this course contributes towards various Specialization or Professional Certificate programs, including the Meta Android Developer Professional Certificate and the Meta iOS Developer Professional Certificate. By the course's conclusion, learners will be proficient in explaining foundational web development principles with JavaScript, applying JavaScript within the React framework, and conducting effective code testing using Jest.

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Always refer to the module on your course for the most accurate and up-to-date information.

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If you have any questions that are not covered in this post, please feel free to leave them in the comments section below. Thank you for your engagement.

Module Quiz: Introduction to JavaScript

1. DevTools console is useful for doing which of the following?

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

2. /* Comment */ is used to indicate what kind of information in javascript?

multi-line comments
inline comments
unfinished code
test code

3. Which of the following is not a valid data type in JavaScript?

numbers
string
booleans
function

4. Which of the following is the logical AND operator in JavaScript?

5. == is the operator for what in JavaScript?

NOT
Assignment
AND
Equality

6. How many times will the following code print the word Hello?

for(var i = 10; i >=1; i--) { console.log("Hello"); }

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

var i = 3; var j = 5; if(i == 3 && j == 5) { console.log("Hello"); } else { console.log("Goodbye"); }

undefined
Goodbye
Nothing
Hello

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

var i = 7; var j = 6; if(i < 7 || j < 5) { console.log("Hello"); } else { console.log("Goodbye"); }

Hello
undefined
Goodbye
Nothing

9. The result of !false is:

false
true
undefined
syntaxError

10. What will be the output of the following code block

var year = 2018;

while (year < 2023) {

console.log(year);

year++;

};

It will log the years 2018 until 2023.
undefined
It will log the years 2018 until 2022.
year = 2023

Module Quiz: The Building Blocks of a Program

1. Which part of the below statement is an object?

const car = {type:"Ford", model:"Model T", color:"white"};

type
car
model
color

2. What error is thrown when trying to run a method on a non-supported data type?

TypeError
RangeError
ReferenceError
SyntaxError

3. What is the effect of the pop() method in the following code?

var burger = ["bun", "beef", "lettuce", "tomato sauce", "onion", "bun"]; burger.pop()

It turns burger into an object.
It will remove the last bun from the array.
It will remove the first bun from the array.
It has no effect.

4. In the following code, what data type does start: function() {} represent?

var bicycle = { wheels: 2, start: function() { }, stop: function() { } };

Method
Array
Property
Object

5. When the following code runs, what will print out?

try { throw new Error(); console.log('Hello'); } catch(err) { console.log('Goodbye'); }

Hello
Goodbye
err
catch failed

6. What error gets thrown when, for example, one tries to use variables that haven't been declared anywhere?

RangeError
ReferenceError
TypeError
SyntaxError

7. Which of the below will be the output of the following code?

(10).toString(100);

undefined
RangeError
.1
SyntaxError

8. The statement below evaluates to which of the following?

const value = null;

console.log(value);

null
error
value
undefined

9. What will be the output of the following code?

var str = "Hello"; str.match("jello");

null
undefined
SyntaxError
“”

10. Which of the following is used to output an error and pass control to the first catch block?

try
throw
err
ErrorHandling

Module Quiz: Programming Paradigms

Random 1

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

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

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

function scopeTest() { var y = 44; console.log(x); }

scopeTest();

var x = 33;

44
undefined
33
null

3. Which of the following statements describes the outcome of the code block below?

class Cake {

constructor(lyr) { this.layers = lyr;

}

getLayers() { return this.layers; }

class WeddingCake extends Cake {

constructor() { super(2); } getLayers() { return super.getLayers() * 5; }

}

var result = new WeddingCake();

console.log(result.getLayers());

WeddingCake cannot be updated and throws an error.
The constructor is not passed an initial argument and the Console.log will print undefined.
Console.log will print 2.
WeddingCake overrides the getLayers() function to multiply the result by 5.

4. Which of the following statements describes the outcome of the code block below?

class Animal { }

class Dog extends Animal {

constructor() { this.noise = "bark"; }

makeNoise() { return this.noise; }

}

class Wolf extends Dog {

constructor() { super(); this.noise = "growl"; }

}

var result = new Wolf();

console.log(result.makeNoise());

console.log(result.makeNoise()) will log undefined

growl is replaced by bark as the output of console.log(result.makeNoise())
syntaxError
bark is replaced by growl as the output of console.log(result.makeNoise())

5. What is the value of …rest in the following code snippet?

const [a, b, …rest] = [1,2,3,4]

undefined
[3,4]
2
1

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

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

"Burgers", "Fries", undefined
3
"Burgers", "Fries", null
2

7. You can access the Document Object Model from what part of your web browser?

Sources tab
You cannot access the Document Object Model from your web browser.
Elements tab
Console tab

8. Which of the following methods convert a JavaScript object from a JSON string?

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

9. What will be the result of running this code?

var letter = "a";

letter = "b";

console.log(letter);

a
Uncaught SyntaxError: Invalid or unexpected token
b
Uncaught TypeError: Assignment to constant variable

10. What is the keyword for a constructor function which details how an object will be built?

Extends
New
Function
Construct

Random 2

1. Which of the following variable declarations can be redeclared and reassigned?

const
let
var
There are no variable declarations which can be redeclared and reassigned.

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

function scopeTest() { var y = 44; console.log(x); }

var x = 33;

scopeTest();

undefined
null
44
33

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

class Cake {

constructor(lyr) { this.layers = lyr;

}

getLayers() { return this.layers; }

class WeddingCake extends Cake {

constructor() { super(2); } getLayers() { return super.getLayers() * 5; }

}

var result = new WeddingCake();

console.log(result.getLayers());

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

class Animal { }

class Dog extends Animal {

constructor() { this.noise = "bark"; }

makeNoise() { return this.noise; }

}

class Wolf extends Dog {

constructor() { super(); this.noise = "growl"; }

}

var result = new Wolf();

console.log(result.makeNoise());

bark
growl
syntaxError
undefined

5. Which of the following snippets would output [3,4] to the console from the 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)

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

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

2
"Burgers", "Fries", undefined
"Burgers", "Fries", null
3

7. You can access the Document Object Model from what part of your web browser?

Console tab
Sources tab
You cannot access the Document Object Model from your web browser.
Elements tab

8. Which of the following methods convert a JavaScript object from a JSON string?

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

9. What will be the result of running this code?

let letter = "a" letter = "b";

console.log(letter);

a
b
Uncaught TypeError: Assignment to constant variable
Uncaught SyntaxError: Invalid or unexpected token

10. What is a constructor?

An object literal.
A specific object that has been created using the class name.
A function that is called to create an instance of an object.
An instance of a class.

Module Quiz: Testing

1. Which of the following is a framework that can help you run a unit test?

JFrame
JavaFrame
JavaTest
Jest

2. When the following test executes, what format will the result be?

function multiply(a, b) { return a; } expect(multiply(2, 2)).toBe(4);

True/False
String
Success/Fail
Function

3. Which of the following testing types revolves around the idea of having separate, small pieces of code that are easy to test?

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

4. Which of the following describes a measure of what percentage of your code is covered by tests?

TestMeasure
Test coverage
Code coverage
Test%

5. The development of Node.js led to the ability to do which of the following?

Download and manage packages
Estimate code coverage
Write full-stack JavaScript programs.
Run unit tests

6. Which of the following are NOT one of the three types of testing?

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

7. Which command is used to install a Node package?

npm
node
pkg
package

8. package.json is used to do which of the following?

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

9. Which of the following statements are NOT benefits of using Test-Driven Development or TDD?

You have proof that your new implementation is not breaking other parts of the app.
You can run tests without setting them up.
Minimizing regressions like accidental bugs introduced to old code.
You can automate these tests easily and thus keep verifying again and again that the system works as expected.

10. What is the recommended way to separate the code that you are testing from its related dependencies?

Mocking
End-to-end testing
Fakes
module.exports

Final Graded Quiz: Programming with JavaScript

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

const a = 2;

const b = 4;

if(a == 2 && b == 8) { console.log("Green"); }

else { console.log("Blue"); }

Green
null
Blue
syntaxError

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

var message = "Hello";

message += " World!";

message = "Goodbye!";

console.log(message);

Goodbye!
Hello
Hello World!
World!

3. What is the data type of the x variable in the following code?

var x = "Hello";

BigInt
String
Boolean
Number

4. 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"); }

Pear
undefined
Apple
Orange

5. 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);

6. When the following code runs, what will print out?

try { throw new Error(); console.log('Square'); }

catch(err) { console.log('Circle'); }

undefined
Square
Circle
sytaxError

7. What's missing from this JavaScript function declaration?

function(a,b)

{ return a + b }

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

8. What is the output of the code below?

var cat = {}

cat.sound = "meow";

var catSound = "purr"

console.log(catSound)

catSound
meow
purr
{}

9. What is the output of the code below?

var veggies = []

veggies.push('parsley')

veggies.push('carrot')

console.log(veggies[2])

3
1
undefined
2

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

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

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

With document.createElement('h2')
With document.addElement('h2')
With document.buildElement('h2')

12. True or false: Using the npm init -y command, you can initialize a new project with npm by answering all prompts with a yes.

True
False

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

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

14. // is used to indicate what kind of information in javascript?

test code
inline comments
multi-line comments
unfinished code

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

booleans
numbers
function
string

16. The assignment operator in JavaScript is denoted by which of the following symbols?

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

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

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

False
True.

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

False
True

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

False
True

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

Jest Fakes
Jest Snapshot
Jest Mock functions
External mock libraries

22. Which of the following statements about Test-Driven Development or TDD are false?

You can run tests without setting them up.
You have proof that your new implementation is not breaking other parts of the app.
You can automate these tests easily and thus keep verifying again and again that the system works as expected.
Minimizing regressions like accidental bugs introduced to old code.

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

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

24. 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());

25. 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());

growl
meow
syntaxError
undefined

26. 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(c+d)
console.log(c,d)
console.log(...rest)
console.log(rest)

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

False
True

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

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

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

New
Extends
Construct
Function

30.What's Which of the following concepts are not associated with the concept of functional programming?

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

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Mobile Development and JavaScript | Coursera Quiz Answers

Module Quiz: Introduction to JavaScript

Module Quiz: The Building Blocks of a Program

Module Quiz: Programming Paradigms

Module Quiz: Testing

Final Graded Quiz: Programming with JavaScript

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