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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

Section	Objectives
Browser and DOM Interaction	- Event handling and propagation - Browser APIs (fetch, storage, timers) - DOM manipulation and traversal
Asynchronous JavaScript	- Promises and async/await - Error handling in async workflows - Event loop and concurrency model
Testing and Debugging	- Debugging techniques and tools - Unit testing principles
JavaScript Language Fundamentals	- Data types, variables, and operators - ES6+ syntax and features - Functions, scope, and closures
Salesforce Platform Integration	- Lightning Web Components (LWC) JavaScript usage - Calling Apex methods from JavaScript - Security considerations in Salesforce JavaScript

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q72-Q77):

NEW QUESTION # 72
Which code statement correctly retrieves and returns an object from localStorage?

A. constretrieveFromLocalStorage = (storageKey) =>{return window.localStorage[storageKey];}
B. const retrieveFromLocalStorage = () =>{return
JSON.stringify(window.localStorage.getItem(storageKey));}
C. const retrieveFromLocalStorage = (storageKey) =>{return window.localStorage.getItem(storageKey);}
D. const retrieveFromLocalStorage = (storageKey) =>{return
JSON.parse(window.localStorage.getItem(storageKey));}

Answer: D

NEW QUESTION # 73
is below:
<input type="file" onchange="previewFile()">
<img src="" height="200" alt="Image Preview..."/>
The JavaScript portion is:
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 }
In lines 04 and 08, which code allows the user to select an image from their local computer , and to display the image in the browser?

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

Answer: D

NEW QUESTION # 74
Refer to following code block:
Let array = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11,];
Let output =0;
For (let num of array){
if (output >0){
Break;
}
if(num % 2 == 0){
Continue;
}
Output +=num;
What is the value of output after the code executes?

A. 0
B. 1
C. 2
D. 3

Answer: C

NEW QUESTION # 75
Refer to the code below:

What is the value of result when the code executes?

A. 5 - 10
B. 10 - 5
C. 5 - 5
D. 10 - 10

Answer: D

NEW QUESTION # 76
A developer wrote the following code to test a sum3 function that takes in an array of numbers and returns the sum of the first three numbers in the array, and the test passes.
A different developer made changes to the behavior of sum3 to instead sum only the first two numbers present in the array.

Which two results occur when running this test on the updated sum3 function?
Choose 2 answers

A. The line 02 assertion fails.
B. The line 05 assertion fails.
C. The line 05 assertion passes.
D. The line 02 assertion passes.

Answer: B,D

NEW QUESTION # 77
......

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