Exam JavaScript-Developer-I Book | JavaScript-Developer-I Exam Questions Vce

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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

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

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q17-Q22):

NEW QUESTION # 17
Given the following code:
Let x =('15' + 10)*2;
What is the value of a?

A. 0
B. 1
C. 2
D. 3

Answer: D

NEW QUESTION # 18
A developer executes:
document.cookie;
document.cookie = ' key=John Smith ' ;
What is the behavior?

A. Cookies are read and the key value is set, and all cookies are wiped.
B. Cookies are not read because line 01 should be document.cookies, but the key value is set and all cookies are wiped.
C. Cookies are read, but the key value is not set because the value is not URL encoded.
D. Cookies are read and the key value is set, the remaining cookies are unaffected.

Answer: D

NEW QUESTION # 19
Refer to the code below:
Let car1 = new Promise((_ , reject) =>
setTimeout(reject, 2000, "car 1 crashed in" =>
Let car2 =new Promise(resolve => setTimeout(resolve, 1500, "car 2 completed") Let car3 =new Promise(resolve => setTimeout(resolve, 3000, "car 3 completed") Promise.race(( car1, car2, car3))
.then (value => (
Let result = '$(value) the race.';)}
.catch(arr => {
console.log("Race is cancelled.", err);
});
What is the value of result when Promise.race executes?

A. Race is cancelled.
B. Car 1 crashed in the race.
C. Car 3 completes the race
D. Car 2 completed the race.

Answer: D

NEW QUESTION # 20
developer is trying to convince management that their team will benefit from using Node.js for a backend server that they are going to create. The server will be a web server that handles API requests from a website that the team has already built using HTML, CSS, and JavaScript.
Which three benefits of Node.js can the developer use to persuade their manager?
Choose 3 answers:

A. Uses non-blocking functionality for performant request handling .
B. Executes server-side JavaScript code to avoid learning a new language.
C. Performs a static analysis on code before execution to look for runtime errors.
D. Ensures stability with one major release every few years.
E. Installs with its own package manager to install and manage third-party libraries.

Answer: A,C,E

NEW QUESTION # 21
Refer to the code below:
<html lang="en">
<table onclick="console.log(Table log');">
<tr id="row1">
<td>Click me!</td>
</tr>
<table>
<script>
function printMessage(event) {
console.log('Row log');
}
Let elem = document.getElementById('row1');
elem.addEventListener('click', printMessage, false);
</script>
</html>
Which code change should be made for the console to log only Row log when 'Click me! ' is
clicked?

A. Add event.removeEventListener(); toprintMessage function.
B. Add.event.stopPropagation(); to window.onLoad event handler.
C. Add event.removeEventListener(); to window.onLoad event handler.
D. Add event.stopPropagation(); to printMessage function.

Answer: D

NEW QUESTION # 22
......

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