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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

SectionWeightObjectives
Topic 1: Objects, Functions, and Classes25%- Object creation, properties, and methods
- Modules and imports/exports
- Decorators and advanced function patterns
- Function definitions, parameters, and scope
- Class syntax, inheritance, and prototypes
- Closures and execution context
Topic 2: Testing7%- Testing frameworks and assertions
- Unit testing concepts
- Test doubles and mocks
- Code coverage and best practices
Topic 3: Asynchronous Programming13%- Async/await syntax
- Event loop and micro/macro tasks
- Promises and chaining
- Callbacks and callback hell
- Fetch API and HTTP requests
Topic 4: Debugging and Error Handling7%- Console methods and logging
- Debugging tools and breakpoints
- Defensive programming practices
- Error types and exception handling
Topic 5: Browsers and Events17%- Browser APIs and Web Storage
- Window and document object properties
- Script loading and execution order
- Document Object Model (DOM) manipulation
- Event handling, propagation, and delegation
Topic 6: Variables, Types, and Collections23%- JSON parsing and usage
- Type coercion and conversion rules
- Array methods and data manipulation
- Variable declaration and initialization
- Truthy and falsy values
- Working with strings, numbers, dates, and booleans
Topic 7: Server-Side JavaScript8%- Node.js fundamentals and runtime
- Command-line tools and scripts
- Core Node.js modules
- Module system and require/import

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q54-Q59):

NEW QUESTION # 54
Refer to the code below:

What is the value of result when Promise. race executes?

Answer: A


NEW QUESTION # 55
Refer to HTML below:
<div id ="main">
<div id = " card-00">This card is smaller.</div>
<div id = "card-01">The width and height of this card is determined by its
contents.</div>
</div>
Which expression outputs the screen width of the element with the ID card-01?

Answer: D


NEW QUESTION # 56
Refer to the code below:
01 let o = {
02 get js() {
03 let city1 = String( ' St. Louis ' );
04 let city2 = String( ' New York ' );
05
06 return {
07 firstCity: city1.toLowerCase(),
08 secondCity: city2.toLowerCase(),
09 }
10 }
11 }
What value can a developer expect when referencing o.js.secondCity?

Answer: A

Explanation:
1. Getter Functions in JavaScript
In JavaScript, when an object uses the get keyword, it defines a getter method . Accessing a getter property executes the function and returns its value. Thus:
o.js
does not return the getter function; instead, it executes the function located at:
get js() { ... }
and returns the object inside the return block.
2. Behavior of String() and toLowerCase()
Inside the getter:
let city1 = String( ' St. Louis ' );
let city2 = String( ' New York ' );
String() creates a string value.
Then, the returned object is constructed as:
{
firstCity: city1.toLowerCase(),
secondCity: city2.toLowerCase(),
}
The method toLowerCase() is a standard JavaScript string method that returns a new string with all alphabetic characters converted to lowercase .
Therefore:
city2.toLowerCase()
returns:
' new york '
3. Referencing the Property
When the developer writes:
o.js.secondCity
the following happens:
* The getter js runs and returns an object.
* The returned object includes the property:
secondCity: ' new york '
* Accessing .secondCity retrieves the lowercase string ' new york ' .
Therefore, the correct value is ' new york ' .
Why the Other Options Are Incorrect
A). undefined - incorrect because the property secondCity clearly exists in the returned object.
B). An error - incorrect because no invalid operations occur; all methods and properties are valid.
C). ' New York ' - incorrect because toLowerCase() transforms the string to lowercase.
JavaScript Knowledge References (Text-Based)
* Getter methods using the get keyword return computed values when accessed.
* JavaScript String values support the toLowerCase() method, which returns a lowercase version of the original string.
* Accessing nested properties like o.js.secondCity triggers the getter, returning the constructed object.


NEW QUESTION # 57
Given the code below:

What is logged to the console'

Answer: B


NEW QUESTION # 58
A developer creates a class that represents a blog post based on the requirements that a Post should have a body, author, and view count. The code is shown below:

Which statement should be inserted in the placeholder on line 02 to allow for a variable to be sent to a new instance of a port with the three attributes correctly populated?

Answer: A


NEW QUESTION # 59
......

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