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Salesforce JavaScript-Developer-I is a certification exam designed for professionals who want to demonstrate their expertise in using JavaScript and related technologies to develop custom applications on the Salesforce platform. JavaScript-Developer-I exam measures the candidate's knowledge of the fundamental concepts of JavaScript, including data types, control structures, functions, arrays, and objects, as well as their ability to apply this knowledge to solve real-world programming problems.

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Salesforce is a cloud-based software that provides customer relationship management (CRM) and other business solutions. As a widely adopted CRM platform, Salesforce offers various certifications that enable professionals to demonstrate their skills in different areas of Salesforce. Among these certifications is the Salesforce Certified JavaScript Developer I, which focuses on JavaScript and its integration with Salesforce.

Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q133-Q138):

NEW QUESTION # 133
A developer wrote a fizzbuzz function that when passed in a number, returns the following:
Fizz if the number is divisible by 3.
Buzz if the number is divisible by 5.
Fizzbuzz if the number is divisible by both 3 and 5.
Empty string if the number is divisible by neither 3 or 5.
Which two test cases will properly test scenarios for the fizzbuss function?

A. Let res = fizzbuss (3) ;
Console.assert (res === 'buzz' ) ;
B. Let res = fizzbuss (5) ;
Console. assert (res === '' ) ;
C. Let res = fizzbuss (15) ;
Console. assert (res === 'fizzbuzz' ) ;
D. Let res = fizzbuss (Infinity);
Console.assert (res === '' ) ;

Answer: C,D

NEW QUESTION # 134
A developer wants to create a simple image upload using the File API.
HTML:
< input type= " file " onchange= " previewFile() " >
< img src= " " height= " 200 " alt= " Image preview... " / >
JavaScript:
01 function previewFile() {
02 const preview = document.querySelector( ' img ' );
03 const file = document.querySelector( ' input[type=file] ' ).files[0];
04 // line 4 code
05 reader.addEventListener( " load " , () = > {
06 preview.src = reader.result;
07 }, false);
08 // line 8 code
09 }
Which code in lines 04 and 08 allows the selected local image to be displayed?

A. 04 const reader = new FileReader();
08 if (file) URL.createObjectURL(file);
B. 04 const reader = new File();
08 if (file) reader.readAsDataURL(file);
C. 04 const reader = new FileReader();
08 if (file) reader.readAsDataURL(file);

Answer: C

Explanation:
The File API in browsers provides the FileReader object to read file contents selected from < input type= " file " > .
Important knowledge points:
* new FileReader() creates a file-reading object.
* .readAsDataURL(file) reads a file and produces a Base64 URL string.
* The " load " event fires when the file has finished reading.
* reader.result contains the data URL after reading completes.
Therefore, the correct implementation must:
* Create a FileReader instance:
* const reader = new FileReader();
* Call:
* reader.readAsDataURL(file);
* Use the load event handler to assign the image preview:
* preview.src = reader.result;
Option B is the only option that matches valid JavaScript File API usage.
Option A is incorrect because File is not a constructor for reading files.
Option C is incorrect because URL.createObjectURL(file) must be assigned directly as a URL, not used with reader.result.
JavaScript Knowledge References (text-only)
* The file-reading interface in browsers is FileReader.
* readAsDataURL() loads files as Base64 data URLs.
* The load event indicates when the reader has finished and reader.result is available.

NEW QUESTION # 135
Refer to the code below:

Which code executes syhello once, two minutes from now?

A. SetTimeout (sayhello, 120000) ;
B. delay (sayhello, 120000) ;
C. SetTimeout (sayhello( ), 120000) ;
D. SetInterval (sayhello, 120000) ;

Answer: C

NEW QUESTION # 136
Which two options are core Node.js modules?
Choose 2 answers

A. worker
B. isotream
C. exception
D. http

Answer: B,D

NEW QUESTION # 137
A developer receives a comment from the Tech Lead that the code given below has error:
const monthName = 'July';
const year = 2019;
if(year === 2019) {
monthName = 'June';
}
Which line edit should be made to make this code run?

A. 03 if (year == 2019) {
B. 02 const year = 2020;
C. 01 let monthName ='July';
D. 02 let year =2019;

Answer: C

NEW QUESTION # 138
......

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