Trustworthy JSA-41-01 Dumps Are Available – You Can Read the JSA-41-01 Free Dumps (Part 1, Q1-Q41) First to Check the Quality

1. Which of the following methods will correctly perform a deep clone of an object in JavaScript?

2. 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?

3. 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?

4. 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?

5. 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?

6. 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?

7. 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?

8. 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)?

9. Which two options correctly demonstrate different ways to create a new object with a Name property set to "Gadget" without using a class?

10. Which of the following code snippets correctly initializes an array, adds a new element to the end, and removes the first element?

11. Which two statements correctly demonstrate the use of prototypes to add a greet method to all instances of a Person constructor function?

1. function Person(name) {

2. this.name = name;

3. }

12. You are managing a collection of students enrolled in different courses. You need to find the total number of unique students across all courses.

Given the following code snippets, which one correctly calculates the number of unique students?

1. let course1 = new Set(['Alice', 'Bob', 'Charlie']);

2. let course2 = new Set(['Alice', 'Dave', 'Eve']);

3. let course3 = new Set(['Charlie', 'Frank', 'George']);

Which code snippet correctly calculates the number of unique students?

13. Which of the following code snippets correctly implements a generator function and uses it as an element of an iterable object to generate a sequence of numbers from 1 to 5?

14. Which of the following code snippets correctly defines a Person class with a constructor that initializes name and age properties, and a greet() method that logs a greeting message?

15. You need to extend the String prototype to add a method reverse that returns the string reversed.

Which of the following code snippets correctly achieves this?

16. Given the following JavaScript object:

1. const user = {

2. name: "Alice",

3. age: 30,

4. email: "[email protected]",

5. isActive: true

6. };

Which of the following statements correctly converts this object to a JSON string?

17. Which statement best describes the purpose of using the new operator with a constructor function in JavaScript?

18. You are developing a JavaScript utility that filters an array of numbers based on a given criterion. The criterion is provided as a function. Implement the filterArray function that takes an array and a function criterion and returns a new array with elements that satisfy the criterion.

Which of the following implementations correctly achieves this?

19. How can you add a new method getInfo to the following JavaScript object after it has been created?

1. const book = {

2. title: "JavaScript: The Good Parts",

3. author: "Douglas Crockford",

4. year: 2008

5. };

20. You have an array of objects representing users with their respective login timestamps. You need to find the user who logged in most recently.

Which of the following code snippets correctly implements this logic?

1. const users = [{

2. name: 'Alice',

3. login: new Date('2023-07-01T12:00:00')

4. },

5. {

6. name: 'Bob',

7. login: new Date('2023-07-01T13:00:00')

8. },

9. {

10. name: 'Charlie',

11. login: new Date('2023-07-01T11:30:00')

12. }

13. ];

14.

15. const mostRecentUser = users.reduce((latest, user) => {

16. return user.login > latest.login ? user: latest;

17. });

18. console.log(mostRecentUser.name);

21. You are creating a class hierarchy for an educational platform. You have a User class with a method

getRole(), and you extend this class with an Instructor class that overrides the getRole()

method. If an instance of Instructor calls the getRole()

method, which method will be executed?

22. Which of the following regular expressions correctly matches a valid US phone number in the format (XXX) XXX-XXXX where X is a digit?

23. Consider the following JavaScript code:

1. let data = {

2. users: [{

6. },

7. {

11. },

12. {

16. }

17. ]

18. };

19.

20. function getActiveUserNames(users) {

21. return users

24. }

25.

26. let activeUserNames = getActiveUserNames(data.users);

27. console.log(activeUserNames);

What will be logged to the console?

24. You are working on a project where you have two objects representing user preferences, and you need to merge them into one object. The second object's properties should overwrite those of the first object if there are conflicts.

Which code snippet correctly merges the two objects using the spread operator?

1. const preferences1 = {

2. theme: 'dark',

3. notifications: true,

4. fontSize: 'medium'

5. };

6.

7. const preferences2 = {

8. notifications: false,

9. language: 'en'

10. };

11.

12. const mergedPreferences = __________;

13.

14. console.log(mergedPreferences);

25. You have an array of objects representing employees. Each employee object has properties name, department, and salary. Write a JavaScript function that filters out employees who are in the "HR" department and sorts the remaining employees by their salary in descending order.

Which of the following functions correctly implements this?

26. You have a function fetchData that fetches data from an API and returns a promise. You need to process this data in two stages: first, you need to filter the data based on a condition, and then you need to transform the filtered data.

How can you achieve this using JavaScript Promises?

27. Given the following code snippet, what will be the output when the printDetails() method is called?

1. class User {

2. constructor(name, age) {

3. this.name = name;

4. this.age = age;

5. }

6.

7. printDetails() {

8. console.log(`Name: ${this.name}, Age: ${this.age}`);

9. }

10. }

11.

12. class Admin extends User {

13. constructor(name, age, role) {

14. super(name, age);

15. this.role = role;

16. }

17.

18. printDetails() {

19. console.log(`Name: ${this.name}, Age: ${this.age}, Role: ${this.role}`);

20. }

21. }

22.

23. const admin = new Admin('Alice', 30, 'Administrator');

24. admin.printDetails();

28. Consider the following object:

1. var car = {

2. make: "Toyota",

3. model: "Camry",

4. year: 2021,

5. start: function() {

6. console.log("Car started");

7. }

8. };

Which of the following statements will correctly access the model property of the car object?

29. You are writing a function fetchData that makes an asynchronous call to an API to retrieve data.

You want to handle the promise returned by this function to ensure that:

1. You log the data if the call is successful.

2. You log an error message if the call fails.

3. You log a message "Operation complete" after the promise is settled (regardless of success or failure).

Which of the following code snippets correctly implements this logic?

30. You need to merge multiple sets of project IDs into a single set to ensure all project IDs are unique.

Given the following sets, which option correctly combines them?

1. let projectA = new Set([1, 2, 3]);

2. let projectB = new Set([3, 4, 5]);

3. let projectC = new Set([5, 6, 7]);

4. let allProjects = /* missing code */;

What should replace /* missing code */ to correctly combine all sets into a single set?

31. Consider the following code snippet:

1. function* idGenerator() {

2. let id = 1;

3. while (true) {

4. yield id++;

5. }

6. }

7.

8. const gen = idGenerator();

9. console.log(gen.next().value); // ?

10. console.log(gen.next().value); // ?

11. console.log(gen.next().value); // ?

What will be the output of the above code?

32. Consider the following code snippet in JavaScript:

1. class Inventory {

2. constructor(items) {

3. this._items = items;

4. }

5.

6. get totalItems() {

7. return this._items.reduce((sum, item) => sum + item.quantity, 0);

8. }

9.

10. set updateItem(itemDetails) {

11. const { name, quantity } = itemDetails;

12. const item = this._items.find(i => i.name === name);

13. if (item) {

14. item.quantity = quantity;

15. } else {

16. this._items.push({ name, quantity });

17. }

18. }

19. }

20.

21. const store = new Inventory([{

22. name: 'Apple',

23. quantity: 10

24. }, {

25. name: 'Banana',

26. quantity: 20

27. }]);

28. store.updateItem = { name: 'Apple', quantity: 15 };

29. store.updateItem = { name: 'Orange', quantity: 5 };

30. console.log(store.totalItems);

What will be the output of the console.log(store.totalItems) statement?

33. You are tasked with creating a function that takes an object representing a student with properties name, age, and grades, and returns a string summarizing the student's information.

Which function implementation is correct?

1. const student = {

2. name: 'John Smith',

3. age: 20,

4. grades: [85, 90, 78]

5. };

6.

7. function summarizeStudent(student) {

8. __________

9. }

10.

11. const summary = summarizeStudent(student);

12. console.log(summary);

34. Consider the following code snippet:

1. function createCounter() {

2. let count = 0;

3. return {

4. increment: function() {

7. },

8. decrement: function() {

11. }

12. };

13. }

14.

15. const counter = createCounter();

16. console.log(counter.increment());

17. console.log(counter.increment());

18. console.log(counter.decrement());

Why does the variable count retain its value between calls to increment and decrement?

35. Which of the following best explains the concept of prototype-based inheritance in JavaScript?

36. Given the following code snippet, what will be the output?

1. let str = new String("Hello World");

2. str = str.toLowerCase().toUpperCase();

3. console.log(str);

37. Given a JavaScript function that calculates the square root of the sum of squares of two numbers, which of the following implementations is correct?

1. function sqrtOfSumOfSquares(a, b) {

2. // code here

3. }

38. You are working on a web application where you need to sequentially fetch user data, posts, and comments from an API. You want to handle these operations using async and await for better readability and maintainability.

1. async function fetchData() {

2. try {

3. const userData = await fetchUserData();

4. const posts = await fetchPosts();

5. const comments = await fetchComments();

6. console.log('Data fetched successfully:', {

10. });

11. } catch (error) {

12. console.error('An error occurred:', error);

13. }

14. }

What is the primary advantage of using async and await in this scenario?

39. Given the following class-based implementation in JavaScript, what will be the output when creating an instance of Dog and calling the makeSound method?

1. class Animal {

2. constructor(name) {

3. this.name = name;

4. }

5.

6. makeSound() {

7. console.log('Some generic animal sound');

8. }

9. }

10.

11. class Dog extends Animal {

12. makeSound() {

13. console.log('Bark');

14. }

15. }

16.

17. const myDog = new Dog('Buddy');

18. myDog.makeSound();

40. You need to create an object in JavaScript without using the class keyword or a constructor function.

Which of the following methods can you use to achieve this?