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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

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

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q26-Q31):

NEW QUESTION # 26
A developer wrote the following code to test a sum3 function that takes in an array of numbers and returns the sum of the first three numbers in the array. The test passes:

A different developer made changes to the behavior of sum3 to instead sum all of the number present In the array.
Which two results occur when running the test on the updated sum3 function?
Choose 2 answers

A. The line 05 assertion fails.
B. The line 02 assertion passes.
C. The line 05 assertion passes.
D. The line 02 assertion fails.

Answer: A,B

NEW QUESTION # 27
Which code statement below correctly persists an objects in local Storage ?

A. const setLocalStorage = (storageKey, jsObject) => {
window.localStorage.setItem(storageKey, JSON.stringify(jsObject));
}
B. const setLocalStorage = ( jsObject) => {
window.localStorage.connectObject(jsObject));
}
C. const setLocalStorage = ( jsObject) => {
window.localStorage.setItem(jsObject);
}
D. const setLocalStorage = (storageKey, jsObject) => {
window.localStorage.persist(storageKey, jsObject);
}

Answer: A

NEW QUESTION # 28
Refer to the code below:
Const myFunction = arr => {
Return arr.reduce((result, current) =>{
Return result = current;
}, 10};
}
What is the output of this function when called with an empty array ?

A. Throws an error
B. Returns 0
C. Returns NaN
D. Returns 10

Answer: C

NEW QUESTION # 29
A developer initiates a server with the file server.js and adds dependencies in the source code ' s package.json that are required to run the server.
Which command should the developer run to start the server locally?

A. start server.js
B. npm start server.js
C. npm start
D. node start

Answer: C

Explanation:
Comprehensive and Detailed Explanation From JavaScript/Node.js Knowledge:
In a Node.js project that uses package.json, you typically define a " start " script:
{
" scripts " : {
" start " : " node server.js "
}
}
Then you start the app with:
npm start
npm start:
* Looks up the " start " script in package.json.
* Runs the command defined there (commonly node server.js).
* This is the standard way to start a Node.js app with npm-managed dependencies.
Why others are incorrect:
* A. node start
* Tries to run a file named start with Node; does not use package.json scripts.
* C. npm start server.js
* npm start does not take the script filename as an argument in this way; it just runs the start script as defined.
* D. start server.js
* Not an npm or node command; on some shells it just tries to "start" a process but is not the standard Node/npm workflow.
Relevant concepts: package.json, npm scripts, npm start, Node entry file execution.

NEW QUESTION # 30
Which option is true about the strict mode in imported modules?

A. You can only reference notStrict() functions from the imported module.
B. Imported modules are in strict mode whether you declare them as such or not.
C. Add the statement use non-strict, before any other statements in the module to enable not-strict mode.
D. Add the statement use strict =false; before any other statements in the module to enable not- strict mode.

Answer: A

NEW QUESTION # 31
......

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