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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

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

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q105-Q110):

NEW QUESTION # 105
Given the code below:
const copy = JSON.stringify([ new String(' false '), new Bollean( false ), undefined ]);
What is the value of copy?

Answer: D


NEW QUESTION # 106
Given the code below:
01 function Person() {
02 this.firstName = ' John ' ;
03 }
04
05 Person.proto = {
06 job: x = > ' Developer '
07 });
08
09 const myFather = new Person();
10 const result = myFather.firstName + ' ' + myFather.job();
What is the value of result when line 10 executes?

Answer: D

Explanation:
* Person.proto is being set, but JavaScript uses Person.prototype for the prototype chain, not Person.proto.
* Therefore, job is not on Person.prototype, and instances of Person do not have job via prototype.
* myFather is created with new Person(), so:
* myFather.firstName is ' John ' .
* myFather.job is undefined.
Attempting to call myFather.job() results in:
TypeError: myFather.job is not a function
So option A is correct.


NEW QUESTION # 107
Given the following code:
document.body.addEventListener(' click ', (event) => {
if (/* CODE REPLACEMENT HERE */) {
console.log('button clicked!');
)
});
Which replacement for the conditional statement on line 02 allows a developer to correctly determine that a button on page is clicked?

Answer: D


NEW QUESTION # 108
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:

Answer: A,B


NEW QUESTION # 109
What are two unique features of fat-arrow functions compared to normal function definitions?

Answer: C,D

Explanation:
Arrow functions have two defining characteristics:
* Implicit return when written as a single expression:
* const fn = () = > 5; // returns 5 automatically
This is unique to arrow functions # A is correct.
* Lexical this binding : Arrow functions do not create their own this. Instead, they use the this value from the surrounding scope # B is correct.
Incorrect options:
* C is false: There is no special argument called parentThis.
* D is the opposite of arrow function behavior: Normal functions create their own this; arrow functions do not.
JavaScript Knowledge References (text-only)
* Arrow functions have lexical this binding.
* Arrow functions support implicit return for single expressions.


NEW QUESTION # 110
......

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