Exam JavaScript-Developer-I Tutorial - JavaScript-Developer-I Real Testing Environment

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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

Section	Weight	Objectives
Topic 1: Server-Side JavaScript	8%	- Core Node.js modules - Module system and require/import - Node.js fundamentals and runtime - Command-line tools and scripts
Topic 2: Asynchronous Programming	13%	- Event loop and micro/macro tasks - Async/await syntax - Promises and chaining - Callbacks and callback hell - Fetch API and HTTP requests
Topic 3: Variables, Types, and Collections	23%	- Working with strings, numbers, dates, and booleans - JSON parsing and usage - Truthy and falsy values - Array methods and data manipulation - Type coercion and conversion rules - Variable declaration and initialization
Topic 4: Objects, Functions, and Classes	25%	- Decorators and advanced function patterns - Class syntax, inheritance, and prototypes - Closures and execution context - Object creation, properties, and methods - Function definitions, parameters, and scope - Modules and imports/exports
Topic 5: Debugging and Error Handling	7%	- Error types and exception handling - Debugging tools and breakpoints - Console methods and logging - Defensive programming practices
Topic 6: Browsers and Events	17%	- Document Object Model (DOM) manipulation - Event handling, propagation, and delegation - Script loading and execution order - Window and document object properties - Browser APIs and Web Storage
Topic 7: Testing	7%	- Test doubles and mocks - Unit testing concepts - Code coverage and best practices - Testing frameworks and assertions

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q63-Q68):

NEW QUESTION # 63
A developer wants to use a module named universalContainersLib and then call functions from it.
How should a developer import every function from the module and then call the functions foo and bar?

A. import * as lib from '/path/universalContainersLib.js';
lib.foo();
lib. bar ();
B. import all from '/path/universalContainersLib.js';
universalContainersLib.foo();
universalContainersLib.bar ();
C. import {foo,bar} from '/path/universalCcontainersLib.js';
foo():
bar()?
D. import * from '/path/universalContainersLib.js';
universalContainersLib. foo ()7
universalContainersLib.bar ();

Answer: A

NEW QUESTION # 64
Refer to the code snippet:
Function getAvailabilityMessage(item) {
If (getAvailability(item)){
Var msg ="Username available";
}
Return msg;
}
A developer writes this code to return a message to user attempting to register a new username. If the username is available, variable.
What is the return value of msg hen getAvailabilityMessage ("newUserName" ) is executed and getAvailability("newUserName") returns false?

A. "newUserName"
B. undefined
C. "Username available"
D. "Msg is not defined"

Answer: B

NEW QUESTION # 65
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?

A. document.getElementById(' card-01 ').getBoundingClientRest().width
B. document.getElementById(' card-01 ').innerHTML.lenght*e
C. document.getElementById(' card-01 ').width
D. document.getElementById(' card-01 ').style.width

Answer: A

NEW QUESTION # 66
Refer to the code below:
01 const exec = (item, delay) =>{
02newPromise(resolve => setTimeout( () => resolve(item), delay)),
03 async function runParallel() {
04 Const (result1, result2, result3) = await Promise.all{
05 [exec ('x', '100') , exec('y', 500), exec('z', '100')]
06 );
07 return `parallel is done: $(result1)$(result2)$(result3)`;
08 }
}
}
Which two statements correctly execute the runParallel () function?
Choose 2 answers

A. Async runParallel () .then(data);
B. runParallel () .then(function(data)return data
C. runParallel () .then(data);
D. runParallel ( ). done(function(data){return data;});

Answer: B,D

NEW QUESTION # 67
A developer is leading the creation of a new browser application that will serve a single
page application. The team wants to use a new web framework Minimalsit.js. The Lead
developer wants to advocate for a more seasoned web framework that already has a
community around it.
Which two frameworks should the lead developer advocate for?
Choose 2 answers

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

Answer: B,D

NEW QUESTION # 68
......

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