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Programming with JavaScript Quiz Answers – Networking Funda
All Weeks Programming with JavaScript Quiz Answers
Table of Contents
Programming with JavaScript Week 01 Quiz Answers
Quiz 1: Self review: Declaring variables
Q 1: Did you complete the Declaring variables exercise?
[expand title=View Answer] Yes [/expand]
Q 2: Are you comfortable with using console.log?
[expand title=View Answer] Yes [/expand]
Q 3: Are you comfortable using the assignment operator?
[expand title=View Answer] Yes [/expand]
Quiz: Self Review – Advanced use of operators
Q 1: Did you complete the Advanced use of operators exercise?
[expand title=View Answer] Yes [/expand]
Q 2: Did you find any part of the exercise on the Advanced Use of Operators difficult?
[expand title=View Answer] No [/expand]
Q 3: Would you say that you are able to explain, in your own words, how logical operators &&, ||, and ! work in JavaScript?
[expand title=View Answer] Yes [/expand]
Quiz 3: Knowledge check: Welcome to Programming
Q 1: What is the data type of the value “Hello, World”?
[expand title=View Answer] string [/expand]
Q 2: What is the data type of the value true?
[expand title=View Answer] boolean [/expand]
Q 3: What is the % operator?
[expand title=View Answer] The modulus operator [/expand]
Q 4: What happens when you use the + operator on two strings?
[expand title=View Answer] They get joined into a single string[/expand]
Q 5: What is the operator symbol && represented in JavaScript?
[expand title=View Answer] The logical AND operator [/expand]
Q 6: What happens when you use the + operator on a string and a number?
[expand title=View Answer] They get joined together as if both of them were strings [/expand]
Q 7: What is the value of I after the following code runs?
var i = 7;
i += 1;
i += 2;
[expand title=View Answer] 10 [/expand]
Quiz 7: Knowledge check – Conditionals and loops
Q 1:Based on the following code, what will print out when the variable I has the value 3?
if(i < 5) {
console.log("Hello");
} else {
console.log("Goodbye");
}
[expand title=View Answer] Hello [/expand]
Q 2: Based on the following code, what will print out when the variable i has the value 1 ?
if(i == 0 && i == 1) {
console.log("Hello");
} else {
console.log("Goodbye");
}
[expand title=View Answer] Goodbye [/expand]
Q 3: How many times will the following code print the word ‘Hello’?
for (i = 0; i < 2; i++) {
console.log("Hello");
}
[expand title=View Answer]2 [/expand]
Q 4: How many times will the following code print the word ‘Hello’?
var i = 0;
while(i < 3) {
console.log("Hello");
i++;
}
[expand title=View Answer] 3 [/expand]
Q 5: How many times will the following code print the word ‘Hello’?
for (i = 0; i < 2; i++) {
for (var j = 0; j < 3; j++) {
console.log("Hello");
}
}
[expand title=View Answer] 6 [/expand]
Q 6: Based on the following code, what will print out when the variable i has the value 7?
if(i <= 5) {
console.log("Hello");
} else if(i <= 10) {
console.log("Goodnight");
} else {
console.log("Goodbye");
}
[expand title=View Answer] Goodnight [/expand]
Q 7: Based on the following code, what will print out when the variable i has the value 3?
switch(i) {
case 1:
console.log("Hello");
break;
case 2:
console.log("Goodnight");
break;
case 3:
console.log("Goodbye");
break;
}
[expand title=View Answer] Goodbye [/expand]
Q 8: Based on the following code, what will print out when the variable i has the value 3 ?
if(i == 2 || i == 3) {
console.log("Hello");
} else {
console.log("Goodbye");
}
[expand title=View Answer] Hello [/expand]
Quiz 8: Module quiz: Introduction to JavaScript
Q 1: You can run JavaScript in a web browser’s dev tools console.
[expand title=View Answer] true[/expand]
Q 2: Which of the following are valid comments in JavaScript? Select all that apply.
[expand title=View Answer] / /Comment 2 [/expand]
Q 3: Which of the following are valid data types in JavaScript? Select all that apply.
[expand title=View Answer]
string
numbers
booleans
null
[/expand]
Q 4: Which of the following is the logical AND operator in JavaScript?
[expand title=View Answer] && [/expand]
Q 5: Which of the following is the assignment operator in JavaScript?
[expand title=View Answer] = [/expand]
Q 6: How many times will the following code print the word ‘Hello’?
[expand title=View Answer] 6 [/expand]
for(var i = 0; i <= 5; i++) {
console.log("Hello");
}
Q 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");
}
[expand title=View Answer] Goodbye [/expand]
Q 8: What will print out when the following code runs?
var i = 7;
var j = 2;
if(i < 7 || j < 5) {
console.log("Hello");
} else {
console.log("Goodbye");
}
[expand title=View Answer] Hello [/expand]
Q 9: The result of! false is:
[expand title=View Answer] true [/expand]
Q 10: What does the operator symbol || represent in JavaScript?
[expand title=View Answer] The logical OR operator[/expand]
Programming with JavaScript Week 02 Quiz Answer
Quiz 1: Knowledge check: Arrays, Objects and Functions
Q 1: What data type is the variable item?
[expand title=View Answer] Array [/expand]
var item = [];
Q 2: What is the value of the result for the following code?
[expand title=View Answer]2[/expand]
var result = “Hello”.indexOf(‘l’);
Q 3: What is the length of the clothes array after this code runs?
var clothes = [];
clothes.push('gray t-shirt');
clothes.push('green scarf');
clothes.pop();
clothes.push('slippers');
clothes.pop();
clothes.push('boots');
clothes.push('old jeans');
[expand title=View Answer] 3 [/expand]
Q 4: What value is printed out by the following code?
var food = [];
food.push('Chocolate');
food.push('Ice cream');
food.push('Donut');
console.log(food[1])
[expand title=View Answer] Ice cream [/expand]
Q 5: How many properties does the dog object have after the following code is run?
var dog = {
color: "brown",
height: 30,
length: 60
};
dog["type"] = "corgi";
[expand title=View Answer] 4 [/expand]
Q 6: In the following function, the variables a and b are known as _______________.
function add(a, b) {
return a + b;
}
[expand title=View Answer] Parameters [/expand]
Q 7: Which of the following are functions of the Math object?
[expand title=View Answer]
random()
sqrt()
[/expand]
Quiz 2: Knowledge check: Error handling
Q 1: What will be printed when the following code runs?
var result = null;
console.log(result);[expand title=View Answer] null [/expand]
Q 2: When the following code runs, what will print out?
try {
console.log('Hello');
} catch(err) {
console.log('Goodbye');
}
[expand title=View Answer] Hello [/expand]
Q 3: If you pass an unsupported data type to a function, what error will be thrown?
[expand title=View Answer] TypeError [/expand]
Q 4: What will print out when the following code runs?
var x;
if(x === null) {
console.log("null");
} else if(x === undefined) {
console.log("undefined");
} else {
console.log("ok");
}
[expand title=View Answer] undefined[/expand]
Q 5: What will print out when the following code runs?
throw new Error();
console.log("Hello");
[expand title=View Answer] Nothing will print out [/expand]
Quiz 3: Module quiz: The Building Blocks of a Program
Q 1: What data type is the variable x?
var x = {};
[expand title=View Answer] Object [/expand]
Q 2: What will be the output of running the following code?
try {
console.log('hello)
} catch(e) {
console.log('caught')
}[expand title=View Answer] Caught [/expand]
Q 3: What value is printed when the following code runs?
var burger = ["bun", "beef", "lettuce", "tomato sauce", "onion", "bun"];
console.log(burger[2]);
[expand title=View Answer] lettuce[/expand]
Q 4: In the following code, how many methods does the bicycle object have?
var bicycle = {
wheels: 2,
start: function() {
},
stop: function() {
}
};
[expand title=View Answer] 2 [/expand]
Q 5: When the following code runs, what will print out?
try {
throw new Error();
console.log('Hello');
} catch(err) {
console.log('Goodbye');
}
[expand title=View Answer] Goodbye[/expand]
Q 6: If you mis-type some code in your JavaScript, what kind of error will that result in?
[expand title=View Answer] TypeError [/expand]
Q 7: Will the following code execute without an error?
function add(a, b) {
console.log(a + b)
}
add(3, "4");
[expand title=View Answer] Yes [/expand]
Q 8: What will be printed when the following code runs?
var result;
console.log(result);
[expand title=View Answer]undefined [/expand]
Q 9: What will be the output of the following code?
var str = "Hello";
str.match("jello");[expand title=View Answer] null [/expand]
Q 10: What will be the output of the following code?
try {
Number(5).toPrecision(300)
} catch(e) {
console.log("There was an error")
}[expand title=View Answer] “There was an error” [/expand]
Programming with JavaScript Week 03 Quiz Answer
Quiz 1: Knowledge check: Introduction to Functional Programming
Q 1: What will print out when the following code runs?
var globalVar = 77;
function scopeTest() {
var localVar = 88;
}
console.log(localVar);
[expand title=View Answer] undefined [/expand]
Q 2: Variables declared using const can be reassigned.
[expand title=View Answer]false [/expand]
Q 3: When a function calls itself, this is known as _____________.
[expand title=View Answer] Recursion [/expand]
Q 4: What will print out when the following code runs?
function meal(animal) {
animal.food = animal.food + 10;
}
var dog = {
food: 10
};
meal(dog);
meal(dog);
console.log(dog.food);
[expand title=View Answer] 30[/expand]
Q 5: What value will print out when the following code runs?
function two() {
return 2;
}
function one() {
return 1;
}
function calculate(initialValue, incrementValue) {
return initialValue() + incrementValue() + incrementValue();
}
console.log(calculate(two, one));
[expand title=View Answer] 4 [/expand]
Quiz 2: Knowledge check: Introduction to Object-Oriented Programming
Q 1: What will print out when the following code runs?
class Cake {
constructor(lyr) {
this.layers = lyr + 1;
}
}
var result = new Cake(1);
console.log(result.layers);
[expand title=View Answer] 2 [/expand]
Q 2: When a class extends another class, this is called ____________.
[expand title=View Answer] Inheritance [/expand]
Q 3: What will print out when the following code runs?
class Animal {
constructor(lg) {
this.legs = lg;
}
}
class Dog extends Animal {
constructor() {
super(4);
}
}
var result = new Dog();
console.log(result.legs);
[expand title=View Answer]4 [/expand]
Q 4: What will print out when the following code runs?
class Animal {
}
class Cat extends Animal {
constructor() {
super();
this.noise = "meow";
}
}
var result = new Animal();
console.log(result.noise);
[expand title=View Answer] undefined [/expand]
Q 5: What will print out when the following code runs?
class Person {
sayHello() {
console.log("Hello");
}
}
class Friend extends Person {
sayHello() {
console.log("Hey");
}
}
var result = new Friend();
result.sayHello();
[expand title=View Answer] Hey [/expand]
Quiz 3: Knowledge check: Advanced JavaScript Features
Q 1: What will print out when the following code runs?
const meal = ["soup", "steak", "ice cream"]
let [starter] = meal;
console.log(starter);
[expand title=View Answer] soup [/expand]
Q 2: The for-of loop works for Object data types.
[expand title=View Answer]false [/expand]
Q 3: What will print out when the following code runs?
let food = "Chocolate";
console.log(`My favourite food is ${food}`);
[expand title=View Answer] My favourite food is Chocolate[/expand]
Q 4: What values will be stored in the set collection after the following code runs?
let set = new Set();
set.add(1);
set.add(2);
set.add(3);
set.add(2);
set.add(1);
[expand title=View Answer] 1, 2, 3 [/expand]
Q 5: What value will be printed out when the following code runs?
let obj = {
key: 1,
value: 4
};
let output = { ...obj };
output.value -= obj.key;
console.log(output.value);
[expand title=View Answer]3[/expand]
Q 6: What value will be printed out when the following code runs?
function count(...basket) {
console.log(basket.length)
}
count(10, 9, 8, 7, 6);
[expand title=View Answer]
10, 9, 8, 7, 6
1, 2, 3, 4, 5
6
5
[/expand]
Quiz 4: Knowledge Check – JavaScript in the browser
Q 1: In the following code, the type attribute can be omitted.
<script type="text/javascript">
//Comment
</script>
[expand title=View Answer] true[/expand]
Q 2: What does the document variable return in JavaScript?
console.log(document);
[expand title=View Answer] The entire webpage in the browser’s memory, as a JavaScript object. [/expand]
.
Q 3: What does the following function return?
getElementById('main-heading')
[expand title=View Answer] The first element that has the id attribute with a value main-heading[/expand]
Q 4: After the following code is run, what will happen when the user clicks on a p element in the browser?
document.querySelector('h1').addEventListener('click',
function() {
console.log('clicked');
});
[expand title=View Answer] Nothing. [/expand]
Q 5: What will be printed when the following code runs?
var result = {
value: 7
};
console.log(JSON.stringify(result));
[expand title=View Answer] {“value”: 7} [/expand]
Quiz 5: Module quiz: Programming Paradigms
Q 1: Variables declared using ‘let’ can be reassigned.
[expand title=View Answer] true [/expand]
Q 2: What will print out when the following code runs?
function scopeTest() {
var y = 44;
console.log(x);
}
var x = 33;
scopeTest();
[expand title=View Answer] 33 [/expand]
Q 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());
[expand title=View Answer] 10 [/expand]
Q 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());
[expand title=View Answer] bark [/expand]
Q 5: Consider this code snippet: ‘const [a, b] = [1,2,3,4] ‘. What is the value of b?
[expand title=View Answer] 2 [/expand]
Q 6: What value will be printed out when the following code runs?
function count(...food) {
console.log(food.length)
}
count("Burgers", "Fries", null);
[expand title=View Answer] 3[/expand]
Q 7: Which of the following are JavaScript methods for querying the Document Object Model?
[expand title=View Answer]
1.getElementsByClassName
2.getElementById
3.querySelector
[/expand]
Q 8: Which of the following methods convert a JavaScript object to and from a JSON string?
[expand title=View Answer]
1.JSON.toString
2.JSON.stringify
[/expand]
Q 9: What will be the result of running this code?
const letter = "a"
letter = "b"[expand title=View Answer] Uncaught TypeError: Assignment to constant variable [/expand]
Q 10: What is a constructor?
[expand title=View Answer] A function that is called to create an instance of an object. [/expand]
Programming with JavaScript Week 04 Quiz Answer
Quiz 1: Knowledge check: Introduction to testing
Q 1:What is the correct way to export the timesTwo function as a module so that Jest can use it in testing files?
[expand title=View Answer] module.exports = timesTwo [/expand]
Q 2: Testing is a way to verify the expectations you have regarding the behavior of your code
[expand title=View Answer] true [/expand]
Q 3: Node.js can be used to build multiple types of applications. Select all that apply.
[expand title=View Answer]
Command line applications
Desktop applications
Web application backends
[/expand]
Q 4: When the following test executes, what will the test result be?
function add(a, b) {
return a + b;
}
expect(add(10, 5)).toBe(16);
[expand title=View Answer] Fail. [/expand]
Q 5: Which of the following is the slowest and most expensive form of testing?
[expand title=View Answer] End-to-end testing (e2e) [/expand]
Q 6: Mocking allows you to separate the code that you are testing from its related dependencies.
[expand title=View Answer] true [/expand]
Quiz 2: Module quiz: Testing
Q 1: What is unit testing?
[expand title=View Answer] Unit testing revolves around the idea of having separate, small pieces of code that are easy to test. [/expand]
Q 2: When the following test executes, what will the test result be?
function subtract(a, b) {
return a - b;
}
expect(subtract(10, 4)).toBe(6);
[expand title=View Answer] Success.[/expand]
Q 3: What is End-to-end testing (e2e)?
[expand title=View Answer] End-to-end testing tries to imitate how a user might interact with your application. [/expand]
Q 4: What is Code Coverage?
[expand title=View Answer] A measure of what percentage of your code is covered by tests. [/expand]
.
Q 5: Node.js can be used to build web application backends.
[expand title=View Answer] true [/expand]
Q 6: When the following test executes, what will the test result be?
function multiply(a, b) {
return a;
}
expect(multiply(2, 2)).toBe(4);
[expand title=View Answer] Fail. [/expand]
Q 7: Which command is used to install a Node package?
[expand title=View Answer] npm [/expand]
Q 8: Which file lists all your application’s required node packages?
[expand title=View Answer] package.json [/expand]
Q 9: A person on your team wants to help with testing. However, they are not a developer and cannot write code. What type of testing is most suited for them?
[expand title=View Answer] End-to-end testing [/expand]
Q 10: What is the recommended way to separate the code that you are testing from its related dependencies?
[expand title=View Answer] module.exports [/expand]
Programming with JavaScript Week 05 Quiz Answer
Q 1: 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");
}
[expand title=View Answer] Green [/expand]
Q 2: What will be the output of the following JavaScript?
var x = true;
x = 23;
console.log(x);
[expand title=View Answer] 23 [/expand]
Q 3: What is the data type of the x variable in the following code?
var x = 0 != 1;
[expand title=View Answer] Number [/expand]
Q 4: What will the following JavaScript code output?
var x = 20;
if(x < 5) {
console.log("Apple");
} else if(x > 10 && x < 20) {
console.log("Pear");
} else {
console.log("Orange");
}
[expand title=View Answer]Orange [/expand]
Q 5: What will the following JavaScript code output?
var result = 0;
var i = 4;
while(i > 0) {
result += 2;
i--;
}
console.log(result);
[expand title=View Answer] 8 [/expand]
Q 6: When the following code runs, what will print out?
try {
throw new Error();
console.log('Square');
} catch(err) {
console.log('Circle');
}
[expand title=View Answer] Circle [/expand]
Q 7: What’s missing from this JavaScript function declaration?
function(a,b) {
return a + b
}
[expand title=View Answer] The function name. [/expand]
Q 8: What is the output of the code below?
var cat = {}
cat.sound = "meow"
var catSound = "purr"
console.log(cat.sound)
[expand title=View Answer]meow [/expand]
Q 9: What is the output of the code below?
var veggies = ['parsley', 'carrot']
console.log(veggies[2])
[expand title=View Answer] undefined [/expand]
Q 10: Which of the following HTML attributes is used to handle a click event?
[expand title=View Answer]onclick [/expand]
‘
Q 11: How can you add an HTML attribute to an HTML element using JavaScript?
[expand title=View Answer] By invoking the setAttribute method on a given element. [/expand]
Q 12: What does this code do?
function addFive(val) {
return val + 5;
};
module.exports = addFive;
[expand title=View Answer] It defines the addFive function and exports it as a Node module so that it can be used in other files. [/expand]
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