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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

Section	Weight	Objectives
Browsers and Events	17%	- Script loading and execution order - Browser APIs and Web Storage - Window and document object properties - Event handling, propagation, and delegation - Document Object Model (DOM) manipulation
Server-Side JavaScript	8%	- Core Node.js modules - Module system and require/import - Node.js fundamentals and runtime - Command-line tools and scripts
Objects, Functions, and Classes	25%	- Function definitions, parameters, and scope - Object creation, properties, and methods - Decorators and advanced function patterns - Closures and execution context - Class syntax, inheritance, and prototypes - Modules and imports/exports
Variables, Types, and Collections	23%	- Type coercion and conversion rules - JSON parsing and usage - Working with strings, numbers, dates, and booleans - Truthy and falsy values - Variable declaration and initialization - Array methods and data manipulation
Asynchronous Programming	13%	- Event loop and micro/macro tasks - Promises and chaining - Fetch API and HTTP requests - Callbacks and callback hell - Async/await syntax
Testing	7%	- Code coverage and best practices - Test doubles and mocks - Testing frameworks and assertions - Unit testing concepts
Debugging and Error Handling	7%	- Console methods and logging - Debugging tools and breakpoints - Error types and exception handling - Defensive programming practices

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JavaScript-Developer-I Latest Study Notes, Official JavaScript-Developer-I Practice Test

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q75-Q80):

NEW QUESTION # 75
Which statement accurately describes the behaviour of the async/ await keyworks ?

A. The associated function can only be called via asynchronous methods
B. The associated class contains some asynchronous functions.
C. The associated function will always return a promise
D. The associated sometimes returns a promise.

Answer: D

NEW QUESTION # 76
Given the code below:
const delay = async delay =>{
return new Promise((resolve,reject)=>{
console.log(1);
setTimeout(resolve,deleay);
});
};
const callDelay = async ()=>{
console.log(2);
const yup = await delay(1000);
console.log(3);
}
console.log(4);
callDelay();
console.log(5);
What is logged to the console?

Answer:

Explanation:
4 2 1 5 3

NEW QUESTION # 77
Which three actions can the code execute in the browser console?

A. Display a report showing the performance of a page.
B. View and change the DOM of the page.
C. View, change, and debug the JavaScript code of the page.
D. Run code that is not related to the page.
E. View and change security cookies.

Answer: B,C,D

Explanation:
The browser console (Developer Tools # Console) allows:
* Running code unrelated to the page Developers can type arbitrary JavaScript not tied to the page's logic. This is allowed # A is correct.
* Viewing and modifying JavaScript code execution Using the Sources tab and console, developers can:
* Inspect variables
* Modify code at runtime
* Set breakpoints Therefore # D is correct.
* Viewing and manipulating the DOM From the console, developers can:
* Query DOM nodes using selectors
* Modify element properties and attributes
* Insert or remove elements Therefore # E is correct.
Why the other options are incorrect:
* B (security cookies) Many cookies have flags such as HttpOnly and Secure. Cookies with the HttpOnly flag cannot be viewed or modified via JavaScript or console. Therefore this is not guaranteed # incorrect.
* C (performance report) The console itself does not provide a performance report. The Performance or Lighthouse tabs provide this, not the console. Therefore incorrect.
JavaScript Knowledge References (text-only)
* Developer console can execute arbitrary JavaScript.
* Console allows DOM inspection and manipulation.
* Security cookies (HttpOnly) cannot be accessed via JavaScript.

NEW QUESTION # 78
Refer to the following code:
function test (val) {
If (val === undefined) {
return 'Undefined values!' ;
}
if (val === null) {
return 'Null value! ';
}
return val;
}
Let x;
test(x);
What is returned by the function call on line 13?

A. Line 13 throws an error.
B. Undefined
C. 'Null value!'
D. 'Undefined values!'

Answer: D

NEW QUESTION # 79
A developer is leading the creating of a new browser application that will server a single page application. The team wants to use a new web framework Minialist.js. The lead developer wants to advocate for a more seasoned wen framework that already has a community around it.
Which two frameworks should the load developer advocate for?

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

Answer: A,D

NEW QUESTION # 80
......

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