JavaScript-Developer-I最新考證 - JavaScript-Developer-I考古題更新

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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

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

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最新的 Salesforce Developer JavaScript-Developer-I 免費考試真題 (Q134-Q139):

問題 #134
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;

答案：C

問題 #135
A developer is trying to handle an error within a function.
Which code segment shows the correct approach to handle an error without propagating it elsewhere?
A)

B)

C)

D)

A. Option A
B. Option D
C. Option C
D. Option B

答案：B

問題 #136
Which three browser specific APIs are available for developer to persist data between page loads?
Choose 3 answers

A. IIFEs
B. global variables
C. indexedDB
D. localStorage
E. cookies

答案：A,C,D

問題 #137
A developer has an is Dog function that takes one argument cat. They want to schedule the function to run every minute.
What is the correct syntax for scheduling this function?

A. setInterval(isDog, 60000,'cat');

答案：A

問題 #138
A developer wants to use a module named universalContainersLib andthen call functions from it.
How should a developer import every function from the module and then call the functions foo and bar?

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

答案：B

問題 #139
......

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