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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

Section	Objectives
Topic 1: Asynchronous JavaScript	- Promises and async/await - Error handling in async workflows - Event loop and concurrency model
Topic 2: Browser and DOM Interaction	- Event handling and propagation - Browser APIs (fetch, storage, timers) - DOM manipulation and traversal
Topic 3: Testing and Debugging	- Debugging techniques and tools - Unit testing principles
Topic 4: Salesforce Platform Integration	- Lightning Web Components (LWC) JavaScript usage - Security considerations in Salesforce JavaScript - Calling Apex methods from JavaScript
Topic 5: JavaScript Language Fundamentals	- ES6+ syntax and features - Functions, scope, and closures - Data types, variables, and operators

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q90-Q95):

NEW QUESTION # 90
Given the code below:
Function myFunction(){
A =5;
Var b =1;
}
myFunction();
console.log(a);
console.log(b);
What is the expected output?

A. Line 08 thrones an error, therefore line 09 is never executed.
B. Both lines 08 and 09 are executed, and the variables are outputted.
C. Line 08 outputs the variable, but line 09 throws an error.
D. Both lines 08 and 09 are executed, but values outputted are undefined.

Answer: C

NEW QUESTION # 91
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) reader.readAsDataURL(file);
B. 04 const reader = new File();
08 if (file) reader.readAsDataURL(file);
C. 04 const reader = new FileReader();
08 if (file) URL.createObjectURL(file);
D. 04 const reader = new File();
08 if (file) URL.createObjectURL(file);

Answer: A

NEW QUESTION # 92
A developer is creating a simple webpage with a button. When a user clicks this button
for the first time, a message is displayed.
The developer wrote the JavaScript code below, but something is missing. The
message gets displayed every time a user clicks the button, instead of just the first time.
01 function listen(event) {
02 alert ( 'Hey! I am John Doe') ;
03 button.addEventListener ('click', listen);
Which two code lines make this code work as required?
Choose 2 answers

A. On line 02, use event.first to test if it is the first execution.
B. On line 06, add an option called once to button.addEventListener().
C. On line 04, use button.removeEventListener(' click" , listen);
D. On line 04, use event.stopPropagation ( ),

Answer: B,C

NEW QUESTION # 93
Value of:
true + 3 + ' 100 ' + null

A. " 4100 "
B. " 2200null "
C. " 4100null "
D. 0

Answer: C

Explanation:
The correct answer is A .
JavaScript evaluates the expression from left to right:
true + 3 + ' 100 ' + null
Step 1:
true + 3
In numeric addition, true is converted to:
1
So:
true + 3
becomes:
1 + 3
Result:
4
Step 2:
4 + ' 100 '
Because one operand is a string, JavaScript performs string concatenation instead of numeric addition.
So:
4 + ' 100 '
becomes:
" 4100 "
Step 3:
" 4100 " + null
Again, because one operand is already a string, JavaScript converts null into the string:
" null "
So the final result is:
" 4100null "
Execution summary:
true + 3 + ' 100 ' + null
// 1 + 3 + ' 100 ' + null
// 4 + ' 100 ' + null
// " 4100 " + null
// " 4100null "
Therefore, the verified answer is A .

NEW QUESTION # 94
Given the JavaScript below:

Which code should replace the placeholder comment on line 05 to highlight accounts that match the search string'

A. 'none1 : "yellow'
B. null : 'yellow'
C. 'yellow' : null
D. 'yellow : 'none'

Answer: D

NEW QUESTION # 95
......

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