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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

SectionWeightObjectives
Topic 1: Objects, Functions, and Classes25%- Higher-order functions
- Modules and decorators
- Function declarations and expressions
- Arrow functions
- Execution flow and context
- ES6 classes and inheritance
- Variable scope and closures
- Prototypal inheritance
- Object creation and manipulation
Topic 2: Variables, Types, and Collections23%- JSON parsing and manipulation
- Strings, numbers, and dates
- Variable declarations and initialization
- Primitive and complex data types
- Truthy and falsy evaluations
- Type coercion and conversion
- Arrays and collections
Topic 3: Testing7%- Test coverage and reliability
- Test effectiveness evaluation
- Writing and modifying unit tests
- Unit testing concepts
Topic 4: Debugging and Error Handling7%- Custom error types
- Console methods for debugging
- Breakpoints and code inspection
- Error handling techniques (try/catch/finally)
Topic 5: Asynchronous Programming13%- Promises (creation, chaining, error handling)
- Event loop and execution flow
- Async/Await syntax
- Callbacks
- Asynchronous patterns for business requirements
Topic 6: Browser and Events17%- Browser-specific APIs
- Interacting with forms and user input
- DOM manipulation
- Event handling and listeners
- Event propagation (bubbling and capturing)
- Browser Developer Tools usage
Topic 7: Server Side JavaScript8%- Core Node.js modules
- Package management (npm)
- Server-side JavaScript implementations
- Node.js fundamentals
- CLI commands

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

NEW QUESTION # 138
01 function changeValue(obj) {
02 obj.value = obj.value / 2;
03 }
04 const objA = {value: 10};
05 const objB = objA;
06
07 changeValue(objB);
08 const result = objA.value;
What is the value of result after the code executes?

Answer: B

Explanation:
* objA is { value: 10 }.
* objB = objA; # both variables reference the same object .
* changeValue(objB);:
obj.value = obj.value / 2; // modifies the shared object
So:
* objA.value becomes 10 / 2 = 5.
Thus result is 5.


NEW QUESTION # 139
Refer to the following object:
const cat ={
firstName: 'Fancy',
lastName: ' Whiskers',
Get fullName() {
return this.firstName + ' ' + this.lastName;
}
};
How can a developer access the fullName property for cat?

Answer: D


NEW QUESTION # 140
Cloud Kicks has a class to represent items for sale in an online store, as shown below:
Class Item{
constructor (name, price){
this.name = name;
this.price = price;
}
formattedPrice(){
return 's' + String(this.price);}}
A new business requirement comes in that requests a ClothingItem class that should have all of
the properties and methods of the Item class but will also have properties that are specific to
clothes.
Which line of code properly declares the clothingItem class such that it inherits from
Item?

Answer: A


NEW QUESTION # 141
Refer to the code below:
Const searchTest = 'Yay! Salesforce is amazing!" ;
Let result1 = searchText.search(/sales/i);
Let result 21 = searchText.search(/sales/i);
console.log(result1);
console.log(result2);
After running this code, which result is displayed on the console?

Answer: A


NEW QUESTION # 142
Refer to the following code:

What will the console when the button is clicked?

Answer: C


NEW QUESTION # 143
......

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