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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

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

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q138-Q143):

NEW QUESTION # 138
Refer to the following code block:
class Animal{
constructor(name){
this.name = name;
}
makeSound(){
console.log(`${this.name} is making a sound.`)
}
}
class Dog extends Animal{
constructor(name){
super(name)
this.name = name;
}
makeSound(){
console.log(`${this.name} is barking.`)
}
}
let myDog = new Dog('Puppy');
myDog.makeSound();
What is the console output?

Answer:

Explanation:
Puppy is barking

NEW QUESTION # 139
Which statement accurately describes an aspect of promises?

A. .then() cannot be added after a catch.
B. Arguments for the callback function passed to .then() are optional.
C. In a.then() function, returning results is not necessary since callbacks will catch the result of a previous promise.
D. .then() manipulates and returns the original promise.

Answer: B

NEW QUESTION # 140
A developer is leading the creation of a new web server for their team that will fulfill API requests from an existing client.
The team wants a web server that runs on Node.Js, and they want to use the new web framework Minimalist.Js. The lead developer wants to advocate for a more seasoned back-end framework that already has a community around it.
Which two frameworks could the lead developer advocate for?
Choose 2 answers

A. Express
B. Angular
C. Gatsby
D. Koa

Answer: B,C

NEW QUESTION # 141
A developer is setting up a Node.js server and is creating a script at the root of the source code, index.js, that will start the server when executed. The developer declares a variable that needs the folder location that the code executes from.
Which global variable can be used in the script?

A. this.path
B. window.location
C. __dirname
D. __filename

Answer: C

Explanation:
In Node.js:
* __filename is the absolute path to the current file (including file name).
* __dirname is the absolute path to the directory that contains the current file.
* window.location is a browser-only global, not available in Node.js.
* this.path is not a standard Node.js global for path information.
The requirement is:
"the folder location that the code executes from."
That is exactly what __dirname provides.
So the correct choice is __dirname.
Concepts: Node.js globals, __filename, __dirname, Node vs browser environment.

NEW QUESTION # 142
Given the JavaScript below:

Which code should replace the placeholder comment on line 06 to hide accounts that do not match the search string?

A. 'None' : 'block'
B. 'Hidden, visible
C. 'Visible : 'hidden'
D. 'Block' : 'none'

Answer: D

NEW QUESTION # 143
......

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