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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

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

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Free PDF Quiz 2026 Salesforce Professional JavaScript-Developer-I Training Pdf

The study material is available in three easy-to-access formats. The first one is PDF format which is printable and portable. You can access it anywhere with your smart devices like smartphones, tablets, and laptops. In addition, you can even print PDF questions in order to study anywhere and pass Salesforce Certified JavaScript Developer (JS-Dev-101) (JavaScript-Developer-I) certification exam.

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

NEW QUESTION # 66
Refer to the following code:

What is the output of line 11?

Answer: D


NEW QUESTION # 67
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 make this code work as expected?

Answer: B


NEW QUESTION # 68
A developer has the function, shown below, that is called when a page loads.

Where can the developer see the log statement after loading the page in the browser?

Answer: D


NEW QUESTION # 69
Which statement accurately describes an aspect of promises?

Answer: B

Explanation:
Evaluate each option:
A). Arguments for .then() are optional.
This is correct.
then() has the signature:
promise.then(onFulfilled?, onRejected?)
Both arguments (onFulfilled and onRejected) are optional.
If a callback is not supplied, JavaScript provides a default pass-through handler.
B). .then() cannot be added after a catch.
Incorrect.
Promises support chaining in any order:
promise
catch(...)
then(...);
After a catch, the chain continues normally.
C). .then() manipulates and returns the original promise.
Incorrect.
then() always returns a new promise , not the original one.
This is fundamental to promise chaining behavior.
D). Returning values in .then() is not necessary.
Incorrect.
If you want the next .then() in the chain to receive a value, the current .then() must explicitly return it:
then(value = > {
return value * 2; // passes to next .then()
})
If nothing is returned, the next .then() receives undefined.
Why A is correct
It is the only statement that accurately describes built-in Promise behavior:
then() accepts optional arguments.
JavaScript Knowledge References (text-only)
* .then(onFulfilled?, onRejected?) accepts optional handlers.
* Promise chaining creates new promises for each .then().
* catch() can be followed by additional .then() calls.
* Returning inside .then() passes values to the next step in the chain.


NEW QUESTION # 70
A team that works on a big project uses npm to deal with the project's dependencies.
A developer added a dependency to manipulated dates and pushed the updates to the remote repository. The rest of the team complains that the dependency does not get download when they execute npm install.
Which two reason could be possible explanation for this?

Answer: A,B,C


NEW QUESTION # 71
......

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