Valid Salesforce JavaScript-Developer-I Cram Materials - JavaScript-Developer-I Test Pdf

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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

Section	Objectives
Topic 1: Browser and DOM Interaction	- Browser APIs (fetch, storage, timers) - Event handling and propagation - DOM manipulation and traversal
Topic 2: Asynchronous JavaScript	- Error handling in async workflows - Event loop and concurrency model - Promises and async/await
Topic 3: Testing and Debugging	- Unit testing principles - Debugging techniques and tools
Topic 4: JavaScript Language Fundamentals	- Data types, variables, and operators - Functions, scope, and closures - ES6+ syntax and features
Topic 5: Salesforce Platform Integration	- Security considerations in Salesforce JavaScript - Lightning Web Components (LWC) JavaScript usage - Calling Apex methods from JavaScript

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q14-Q19):

NEW QUESTION # 14
Refer to following code:
class Vehicle {
constructor(plate) {
This.plate =plate;
}
}
Class Truck extends Vehicle {
constructor(plate, weight) {
//Missing code
This.weight = weight;
}
displayWeight() {
console.log('The truck ${this.plate} has a weight of ${this.weight} lb.');}}
Let myTruck = new Truck('123AB', 5000);
myTruck.displayWeight();
Which statement should be added to line 09 for the code to display 'The truck 123AB has a
weight of 5000lb.'?

A. This.plate =plate;
B. Super.plate =plate;
C. super(plate);
D. Vehicle.plate = plate;

Answer: C

NEW QUESTION # 15
A developer implements and calls the following code when an application state change occurs:

If the back button is clicked after this method is executed, what can a developer expect?

A. A popstate event is fired with a state properly that details the application's last state.
B. The page is navigated away from and previous page in the browser's history is loaded.
C. The page reloads and all JavaScript is reinitialized.
D. A navigate event is fired with a state properly that details previous application state.

Answer: B

NEW QUESTION # 16
Which statement phrases successfully?

A. JSON.parse ( ' foo ' );
B. JSON.parse(' " foo " ');
C. JSON.parse ( " foo " );
D. JSON.parse( " ' foo ' " );

Answer: B

NEW QUESTION # 17
A developer is debugging a web server that uses Node.js The server hits a runtimeerror every third request to an important endpoint on the web server.
The developer added a break point to the start script, that is at index.js at he root of the server's source code. The developer wants to make use of chrome DevTools to debug.
Which command can be run to access DevTools and make sure the breakdown is hit ?

A. Node --inspect-brk index.js
B. Node --inspect index.js
C. Node inspect index.js
D. node -i index.js

Answer: B

NEW QUESTION # 18
Given the following code:

What will be the first four numbers logged?

A. 0112
B. 0012
C. 0123
D. 0122

Answer: A

NEW QUESTION # 19
......

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