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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

Section	Weight	Objectives
Topic 1: Testing	7%	- Unit testing concepts - Testing frameworks and assertions - Test doubles and mocks - Code coverage and best practices
Topic 2: Browsers and Events	17%	- Window and document object properties - Browser APIs and Web Storage - Script loading and execution order - Document Object Model (DOM) manipulation - Event handling, propagation, and delegation
Topic 3: Debugging and Error Handling	7%	- Defensive programming practices - Error types and exception handling - Debugging tools and breakpoints - Console methods and logging
Topic 4: Variables, Types, and Collections	23%	- Variable declaration and initialization - JSON parsing and usage - Truthy and falsy values - Array methods and data manipulation - Working with strings, numbers, dates, and booleans - Type coercion and conversion rules
Topic 5: Server-Side JavaScript	8%	- Node.js fundamentals and runtime - Core Node.js modules - Command-line tools and scripts - Module system and require/import
Topic 6: Asynchronous Programming	13%	- Callbacks and callback hell - Event loop and micro/macro tasks - Async/await syntax - Promises and chaining - Fetch API and HTTP requests
Topic 7: Objects, Functions, and Classes	25%	- Modules and imports/exports - Function definitions, parameters, and scope - Object creation, properties, and methods - Class syntax, inheritance, and prototypes - Closures and execution context - Decorators and advanced function patterns

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q46-Q51):

NEW QUESTION # 46
A developer creates a simple webpage with an input field. When a user enters text in the input field and clicks the button, the actual value of the field must be displayed in the console.
Here is the HTML file content:
<input type =" text" value="Hello" name ="input">
<button type ="button" >Display </button> The developer wrote the javascript code below:
Const button = document.querySelector('button');
button.addEvenListener('click', () => (
Const input = document.querySelector('input');
console.log(input.getAttribute('value'));
When the user clicks the button, the output is always "Hello".
What needs to be done to make this code work as expected?

A. Replace line 02 with button.addCallback("click", function() {
B. Replace line 04 with console.log(input .value);
C. Replace line 02 with button.addEventListener("onclick", function() {
D. Replace line 03 with const input = document.getElementByName('input');

Answer: B

NEW QUESTION # 47
A developer has an ErrorHandler module that contains multiple functions.
What kind of export should be leveraged so that multiple functions can be used?

A. default
B. all
C. named
D. multi

Answer: C

NEW QUESTION # 48
At Universal Containers, every team has its own way of copying JavaScript objects. The
code
Snippet shows an implementation from one team:
Function Person() {
this.firstName = "John";
this.lastName = 'Doe';
This.name =() => (
console.log('Hello $(this.firstName) $(this.firstName)');
)}
Const john = new Person ();
Const dan = JSON.parse(JSON.stringify(john));
dan.firstName ='Dan';
dan.name();
What is the Output of the code execution?

A. Hello Dan Doe
B. TypeError: dan.name is not a function
C. TypeError: Assignment to constant variable.
D. Hello John DOe

Answer: B

NEW QUESTION # 49
Refer to the code below:
For (let number =2: number <= S; number += 1) ( // insert code statement here The developer needs to insert a code statement in the location shown. The code statement has these requirements:
1. Does not require an import
2. Logs an error when the Boolean statement evaluates to false
3. Works In both the browser and Node.js
Which statement meet these requirements?

A. Console. error (number $ 2 == 0) ;
B. Console. Debug (number $ 2 == 0) ;
C. Assert (number $ 2 == 0);
D. Console. Assert ( number $ 2 == 0 ) ;

Answer: D

NEW QUESTION # 50
A developer is asked to fix some bugs reported by users. To do that, the developer adds a breakpoint for debugging.
Function Car (maxSpeed, color){
This.maxspeed =masSpeed;
This.color = color;
Let carSpeed = document.getElementById(' CarSpeed');
Debugger;
Let fourWheels =new Car (carSpeed.value, 'red');
When the code execution stops at the breakpoint on line 06, which two types of information are available in the browser console ?
Choose 2 answers:

A. A variable displaying the number of instances created for the Car Object.
B. The information stored in the window.localStorage property
C. The values of the carSpeed and fourWheels variables
D. The style, event listeners and other attributes applied to the carSpeed DOM element

Answer: B,D

NEW QUESTION # 51
......

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