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Guide for JSA - Certified Associate JavaScript Programmer

Quiz JSA - Certified Associate JavaScript Programmer

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/ 10

Quiz

1/10
Which of the following methods will correctly perform a deep clone of an object in JavaScript?
Select the answer
1 correct answer
A.
original.clone()
B.
JSON.parse(JSON.stringify(original))
C.
Object.create(original)
D.
Object.assign({}, original)

Quiz

2/10
Consider the following JavaScript code snippet: 1. const book = { 2. title: 'The Great Gatsby', 3. author: 'F. Scott Fitzgerald', 4. getSummary: function() { 5. return `${this.title} by ${this.author}`; 6. } 7. }; 8. 9. const getBookSummary = book.getSummary; 10. console.log(getBookSummary()); // What will this log to the console?
Select the answer
1 correct answer
A.
ReferenceError: title is not defined
B.
null
C.
The Great Gatsby by
D.
undefined by undefined
E.
Scott Fitzgerald', 4. getSummary: function() { 5. return `${this.title} by ${this.author}`; 6. } 7. }; 8. 9. const getBookSummary = book.getSummary; 10. console.log(getBookSummary()); // What will this log to the console? A. ReferenceError: title is not defined

Quiz

3/10
Consider the following JavaScript code snippet:
1. const obj = {
2. prop: 42,
3. func: function() {
4. return this.prop;
5. }
6. };
7.
8. const extractedFunc = obj.func;
9. console.log(extractedFunc()); // What will this log to the console?
Select the answer
1 correct answer
A.
42
B.
TypeError: extractedFunc is not a function
C.
undefined
D.
null

Quiz

4/10
You have an array of tasks, where each task is an object with properties
id
,
title
, and
completed
. Write a JavaScript function that returns a new array containing only the titles of the tasks that are not
completed, sorted alphabetically. Which of the following functions correctly implements this?
Select the answer
1 correct answer
A.
function getIncompleteTaskTitles(tasks) { return tasks.sort((a, b) => a.title.localeCompare(b.title)) .filter(task => !task.completed) .map(task => task.title);}
B.
function getIncompleteTaskTitles(tasks) { return tasks.filter(task => task.completed) .map(task => task.title) .sort((a, b) => a.localeCompare(b));}
C.
function getIncompleteTaskTitles(tasks) { return tasks.map(task => task.title) .filter(task => !task.completed) .sort((a, b) => a.localeCompare(b));}
D.
function getIncompleteTaskTitles(tasks) { return tasks.filter(task => !task.completed) .sort((a, b) => a.title.localeCompare(b.title)) .map(task => task.title);}

Quiz

5/10
You have the following JavaScript code:
1. let config = {
2. server: "localhost",
3. port: 8080,
4. options: {
5. secure: true,
6. timeout: 5000
7. },
8. features: {
9. feature1: "enabled",
10. feature2: "disabled"
11. }
12. };
13.
14. let key = "features";
15. let subKey = "feature1";
16. let dynamicKey = "timeout";
Which two of the following expressions correctly access the value
5000
from the
config
object?
Select the answer
2 correct answers
A.
config["options"]["timeout"]
B.
config[key][subKey]
C.
config.options.timeout
D.
config[key].options[dynamicKey]

Quiz

6/10
Consider the following code snippet: 1. let sentence = new String(" JavaScript "); 2. let trimmedSentence = sentence.trim().padEnd(15, "."); 3. console.log(trimmedSentence); What will be the output?
Select the answer
1 correct answer
A.
"JavaScript..."
B.
"JavaScript"
C.
"JavaScript....."
D.
" JavaScript "

Quiz

7/10
You are tasked with writing a JavaScript function that takes multiple arguments and returns the sum of
those arguments. If no arguments are provided, the function should return a default value of 10. Which
implementation correctly achieves this using default parameter values, the rest parameter, and the
spread operator?
Select the answer
1 correct answer
A.
function sum(...args, defaultValue = 10) { return args.length ? args.reduce((a, b) => a + b, 0) : defaultValue;}
B.
function sum(args = [10]) { return args.reduce((a, b) => a + b, 0);}
C.
function sum(defaultValue, ...args = [10]) { return args.reduce((a, b) => a + b, 0);}
D.
function sum(defaultValue = 10, ...args) { return args.length ? args.reduce((a, b) => a + b, 0) : defaultValue;}

Quiz

8/10
Consider the following JavaScript code:
1. class BankAccount {
2. static totalAccounts = 0;
3.
4. constructor(owner, balance) {
5. this.owner = owner;
6. this.balance = balance;
7. BankAccount.incrementAccounts();
8. }
9.
10. static incrementAccounts() {
11. BankAccount.totalAccounts++;
12. }
13. }
14.
15. let account1 = new BankAccount('Alice', 1000);
16. let account2 = new BankAccount('Bob', 1500);
17. let account3 = new BankAccount('Charlie', 2000);
18.
19. console.log(BankAccount.totalAccounts);
What will be the output of
console.log(BankAccount.totalAccounts)
?
Select the answer
1 correct answer
A.
2
B.
1
C.
3
D.
0

Quiz

9/10
Which two options correctly demonstrate different ways to create a new object with a
name
property set to "Gadget" without using a class?
Select the answer
2 correct answers
A.
const obj2 = new Object(); obj2.name = "Gadget";
B.
const obj5 = new Function();obj5.name = "Gadget";
C.
const obj6 = function() { this.name = "Gadget"; };
D.
const obj1 = { name: "Gadget" };
E.
const obj3 = Object.create({ name: "Gadget" });

Quiz

10/10
Which of the following code snippets correctly initializes an array, adds a new element to the end, and
removes the first element?
Select the answer
1 correct answer
A.
let arr = [1, 2, 3];arr.unshift(4);arr.shift();
B.
let arr = [1, 2, 3];arr.push(4);arr.shift();
C.
let arr = [1, 2, 3];arr.pop();arr.push(4);
D.
let arr = [1, 2, 3];arr.push(4);arr.pop();
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Info quiz:

  • Quiz name:JSA - Certified Associate JavaScript Programmer
  • Total number of questions:190
  • Number of questions for the test:50
  • Pass score:80%

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