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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

Section	Weight	Objectives
Browsers and Events	17%	- Document Object Model (DOM) manipulation - Event handling, propagation, and delegation - Browser APIs and Web Storage - Window and document object properties - Script loading and execution order
Debugging and Error Handling	7%	- Console methods and logging - Defensive programming practices - Debugging tools and breakpoints - Error types and exception handling
Asynchronous Programming	13%	- Promises and chaining - Callbacks and callback hell - Fetch API and HTTP requests - Async/await syntax - Event loop and micro/macro tasks
Server-Side JavaScript	8%	- Node.js fundamentals and runtime - Module system and require/import - Command-line tools and scripts - Core Node.js modules
Testing	7%	- Testing frameworks and assertions - Test doubles and mocks - Code coverage and best practices - Unit testing concepts
Objects, Functions, and Classes	25%	- Modules and imports/exports - Decorators and advanced function patterns - Class syntax, inheritance, and prototypes - Function definitions, parameters, and scope - Object creation, properties, and methods - Closures and execution context
Variables, Types, and Collections	23%	- Array methods and data manipulation - Working with strings, numbers, dates, and booleans - JSON parsing and usage - Variable declaration and initialization - Type coercion and conversion rules - Truthy and falsy values

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Latest Salesforce JavaScript-Developer-I Exam Answers | Valid JavaScript-Developer-I Exam Objectives

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q66-Q71):

NEW QUESTION # 66
A developer implements and calls the following code when an application state change occurs:

If the back button is clicked after this method is executed, what can a developer expect?

A. The page is navigated away from and previous page in the browser's history is loaded.
B. The page reloads and all JavaScript is reinitialized.
C. A navigate event is fired with a state properly that details previous application state.
D. A popstate event is fired with a state properly that details the application's last state.

Answer: A

NEW QUESTION # 67
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 fizzbuzz function?
Choose 2 answers

A. let res = fizzbuzz(15);
console.assert ( res === ' fizzbuzz ' )
B. let res = fizzbuzz(Infinity);
console.assert ( res === ' ' )
C. let res = fizzbuzz(3);
console.assert ( res === ' buzz ' )
D. let res = fizzbuzz(5);
console.assert ( res === ' ' );

Answer: A,B,C

NEW QUESTION # 68
Refer to the HTML below:
< div id= " main " >
< ul >
< li > Leo < /li >
< li > Tony < /li >
< li > Tiger < /li >
< /ul >
< /div >
Which JavaScript statement results in changing " Leo " to " The Lion " ?

A. document.querySelectorAll( ' #main #Leo ' ).innerHTML = ' The Lion ' ;
B. document.querySelectorAll( ' #main li,Leo ' ).innerHTML = ' The Lion ' ;
C. document.querySelector( ' #main li:nth-child(1) ' ).innerHTML = ' The Lion ' ;
D. document.querySelector( ' #main li:second-child ' ).innerHTML = ' The Lion ' ;

Answer: C

Explanation:
We want to select the first < li > under #main and change its content.
* document.querySelector(selector) returns the first element matching the CSS selector.
* In the DOM, the < li > elements under < ul > are children in order:
* 1st child: " Leo "
* 2nd child: " Tony "
* 3rd child: " Tiger "
li:nth-child(1) is the CSS pseudo-class that selects the first < li > inside its parent.
So:
document.querySelector( ' #main li:nth-child(1) ' ).innerHTML = ' The Lion ' ; selects the first < li > ( " Leo " ) inside #main and sets its innerHTML to " The Lion " .
Why others are incorrect:
* A. #main #Leo
* There is no element with id " Leo " . id is not set on the < li > , so the selector matches nothing.
* B. li:second-child
* There is no :second-child pseudo-class. The valid pseudo-class is :nth-child(2); and that would select " Tony " , not " Leo " .
* C. ' #main li,Leo '
* This selector means "all #main li and all elements named < Leo > ".
* There is no < Leo > tag, and querySelectorAll returns a NodeList, which does not have a single innerHTML property.
Therefore, D is the correct statement.
Study Guide Concepts:
* document.querySelector vs querySelectorAll
* CSS selectors: nth-child()
* DOM element innerHTML property

NEW QUESTION # 69
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 06, add an option called once to button.addEventListener().
B. On line 04, use button.removeEventListener(' click" , listen);
C. On line 02, use event.first to test if it is the first execution.
D. On line 04, use event.stopPropagation ( ),

Answer: A,B

NEW QUESTION # 70
Given the requirement to refactor the code above to JavaScript class format, which class definition is correct?
A)

B)

C)

D)

A. Option C
B. Option D
C. Option A
D. Option B

Answer: C

NEW QUESTION # 71
......

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