160 Exam Questions for JavaScript-Developer-I Updated Versions With Test Engine
Pass JavaScript-Developer-I Exam with Updated JavaScript-Developer-I Exam Dumps PDF 2021
Who should take the Salesforce JavaScript-Developer-I Exam
This course is designed for Javascript developers starting on the Salesforce platform who require programming customizations on front-end and back-end. There are no prerequisites for Salesforce JavaScript Developer I Exam. Typical job roles that align to the Salesforce Certified JavaScript Developer I are as follows:
- Web application developer
- Support engineer
- Full stack developer
- Technical Product Manager
- Software/backend developer
- Technical Project Manager
- Front end developer
- Salesforce developer
- UI/UX Engineer
- JavaScript programmer
Topics of Salesforce JavaScript Developer I Exam
Aspirants must know the exam topics before they start of preparation. Because it will help them to prepare for the below concepts Salesforce JavaScript-Developer-I exam will include the following topics:
1. Variable, Types, and Collection: 23%
Scenario based coding Variables Creation and Initialization JSON object understanding
2. Object, Functions, and Classes: 25%
Implementation of different functions Understanding of different modules of Javascript Scope of variables and their execution flow
3. Browser and Events: 17%
Handling and propagation of events Development tools of browsers Understanding of browser specific APIs
4. Asynchronous Programming: 13%
Asynchrounous programming different concepts Monitoring and management of different loops
5. Server Side Javascript: 8%
Implementation of Node.js Understanding of Node.js CLI commands
6. Testing: 7%
Unit Testing effectiveness of different tests
NEW QUESTION 72
A developer wants to use a try...catch statement to catch any error that countSheep () may throw and pass it to a handleError () function.
What is the correct implementation of the try...catch?
A)
B)
C)
D)
- A. Option
- B. Option
- C. Option
- D. Option
Answer: A
NEW QUESTION 73
Cloud Kicks has a class to represent item for sale in an online store, as shown below:
A new business requirement comes in that request a clothingitem class, that should have all of the properties and methods of the item class, but will also have properties that are specific top clothes.
Which line of code properly declares the clothingitem class such that it inherits from item?
- A. Class clothingitem implements item (
- B. Class clothingitem extends item (
- C. Class clothing item super item (
- D. Class Clothingitem (
Answer: B
NEW QUESTION 74
Refer to the code below:
Let searchString = ' Look for this ';
Which two options remove the whitespace from the beginning of searchString? Choose 2 answers
- A. trimStart (searchString) ;
- B. searchString. Replace (/^\a\a'/' ' ') ;
- C. searchString. trimstart ( ) ;
- D. searchString. trimEnd ( ) ;
Answer: B,C
NEW QUESTION 75
A developer writes the code below to calculate the factorial of a given number.
What is the result of executing line 04?
- A. RuntimeError
- B. 0
- C. -Infinity
- D. 1
Answer: A
NEW QUESTION 76
Refer to the code below:
What is the output after the code executes?
- A. Developer
- B. ReferenceError: eyeColor is not defined
- C. ReferenceError: assignment to undeclared variable ''Person''
- D. undefined
Answer: D
NEW QUESTION 77
Refer to the code below:
What is displayed when myfunction(true) is called?
- A. 2 2 1 2
- B. 2 2 2 2
- C. 2 2 1 1
- D. 2 2 undefined undefined
Answer: C
NEW QUESTION 78
Given the following code:
What is the logged by the first four log statements?
- A. 0 1 1 2
- B. 0 0 1 2
- C. 0 1 2 2
- D. 0 1 2 3
Answer: A
NEW QUESTION 79
A developer is wondering whether to use, promise, then or provise, catch especially when a promise throws an error.
Which two promises are rejected? Choose 2 answers
- A. Promise , reject ('Cool error here ') , catch (error => console ,error (error));
- B. New Promise((resolve, reject) => ( throw 'Cool error here')) .catch (error => console (error ));
- C. Promise, rejected (Cool error here'), then (error => console (error ));
- D. New promise (() => (throw 'Cool error here ')) , then ((null, error => console, (error)));
Answer: B,D
NEW QUESTION 80
A developer has an ErrorMandler module that contains multiple functions.
What kind of export should be leveraged so that multiple function can be used?
- A. Named
- B. Multi
- C. default
- D. All
Answer: A
NEW QUESTION 81
Refer to the code below:
What is the result of running line 05?
- A. Only apromise runs.
- B. Apromise and bpromise run in parallel.
- C. Neither aPromise or bPromise runs.
- D. aPromise and bPromise run sequentially.
Answer: C
NEW QUESTION 82
Refer to the HTML below:
<p> The current status of an order: < span> id='' status '> In progress < /span> < /p> Which JavaScript Statement changes the text 'In Progress' to Completed'?
- A. Document, getElementById (''# status''), innerHTML = 'Completed' ;
- B. Document, getElementById (status'') , value = completed' ;
- C. Document, getElementById (''status''), innerHTML = 'Completed' ;
- D. Document, getElementById ('',status''), innerHTML = 'Completed' ;
Answer: C
NEW QUESTION 83
A developer wants to leverage a module to print a price in pretty format, and has imported a method as shown below:
Import printPrice from '/path/PrincePrettyPrint. Js';
Based on the code, what must be true about the printPrice function of the PricePrettyPrint modules for this import to work?
- A. printPrice must be a multi export
- B. printPrice must be an default export
- C. printPrice must be named export
- D. printPrice must be an all export
Answer: C
NEW QUESTION 84
Given the JavaSript below:
Which code should replace the placeholder comment on line 05 to hide accounts that do not match the search string?
- A. 'Visible' ; hidden'
- B. none' ; 'block '
- C. 'hidden'; 'visible'
- D. 'Block' ; 'none'
Answer: D
NEW QUESTION 85
Universal Container (UC) notices that its application allows users to search for account makes a network request each time a key is pressed. This results in too many request for the server to handle.
O address this problem, UC decides to implement a deboune function on the search string change handler. Choose 3 answers
- A. If the there is an existing setTimeout and the search string changes, cancel the existing setTimeout using the persisted timeout replace it with a new setTimeout.
- B. When the search string changes, enqueue the request within a setTimeout.
- C. Ensure that the network request has the property debounce set to true,
- D. If there is an existing settimeout and the search string changes, allow the existing setTimeout to finish, and do not enqueue a settimeout.
- E. Store the timeId of the setTimeout last enqueued by the search string change handler.
Answer: A,B,C
NEW QUESTION 86
Refer to the following array:
Let arr1 = [1, 2, 3, 4, 5];
Which two lines of codes result in a second array, arr2, being created such that arr2 is not a reference to arr1? Choose 2 answers
- A. Let arr2 = arr1;
- B. Let arr2 = arr1 sort ();
- C. Let arr2 = Array. From (arr1) ;
- D. Let arr2 = arr1 .slice (0, 5);
Answer: A,B
NEW QUESTION 87
A developer creates a generic function to log custom messages In the console. To do this, the function below is implemented.
Which three console logging methods allow the use of string substitution in line 02?
Choose 3 answers
- A. Assert
- B. Log
- C. Message
- D. error
- E. Info
Answer: A,C,D
NEW QUESTION 88
Which three browser specific APIs are available for developer to persist data between page loads?
Choose 3 answers
- A. localStorage
- B. indexedDB
- C. global variables
- D. cookies
- E. IIFEs
Answer: A,B,E
NEW QUESTION 89
A developer creates a class that represents a blog post based on the requirements that a Post should have a body, author, and view count. The code is shown below:
Which statement should be inserted in the placeholder on line 02 to allow for a variable to be sent to a new instance of a port with the three attributes correctly populated?
- A. Super (body, author, viewCount) (
- B. Function Post (body, author, viewCount) (
- C. Constructor (body, author, viewCount) (
- D. Constructor ( ) (
Answer: C
NEW QUESTION 90
A developer is setting up a new Node.js server with a client library that is built using events and callbacks.
The library:
* Will establish a web socket connection and handle receipt of messages to the server
* Will be imported with require, and made available with a variable called ws.
The developer also wants to add error logging if a connection fails.
Given this information, which code segment show the correct way to set up a client two events that listen at execution time?
A)
B)
C)
D)
- A. Option D
- B. Option B
- C. Option A
- D. Option C
Answer: A
NEW QUESTION 91
Refer to the code below:
Line 05 causes an error.
What are the values of greeting and salutation once code completes?
- A. Greeting is Goodbye and salutation is I say Hello.
- B. Greeting is Hello and salutation is Hello, Hello.
- C. Greeting is Goodbye and salutation is Hello, Hello.
- D. Greeting is Hello and salutation is I say hello.
Answer: B
NEW QUESTION 92
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