評判が高いSalesforce JavaScript-Developer-I認証試験の参考書

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

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Salesforce Certified JavaScript Developer (JS-Dev-101) 認定 JavaScript-Developer-I 試験問題 (Q122-Q127):

質問 # 122
A developer at Universal Containers is creating their new landing page based on HTML, CSS, and JavaScript.
To ensure that visitors have a good experience, a script named personalizeWebsiteContent needs to be executed when the webpage is fully loaded (HTML content and all related files), in order to do some custom initializations.
Which implementation should be used to call Fe:s:-a;::eHec5;te::.-.ter.: based on the business requirement above?

A. Add a handler to the personalizeWebsiteContent script to handle the load event
B. Add a listener to the window object to handle the DOMContentLoaded event
C. Add a listener to the window object to handle the lead event
D. Add a handler to the personalizeWebsiteContent script to handle the DOMContentLoaded event

正解：C

質問 # 123
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);
C. Super.plate =plate;
D. Vehicle.plate = plate;

正解：B

質問 # 124
Given the code below:
Setcurrent URL ();
console.log('The current URL is: ' +url );
function setCurrentUrl() {
Url = window.location.href:
What happens when the code executes?

A. The url variable has global scope and line 02 executes correctly.
B. The url variable has local scope and line 02 throws an error.
C. The url variable has local scope and line 02 executes correctly.
D. The url variable has global scope and line 02 throws an error.

正解：A

質問 # 125
A developer creates an object where its properties should be immutable and prevent properties from being added or modified.
Which method should be used to execute this business requirement ?

A. Object.eval()
B. Object.freeze()
C. Object.const()
D. Object.lock()

正解：B

質問 # 126
Refer to the code below:

Line 05 causes an error.
What are the values of greeting and salutation once code completes?

A. Greeting is Goodbye and salutation is I say Hello.
B. Greeting is Hello and salutation is Hello, Hello.
C. Greeting is Hello and salutation is I say hello.
D. Greeting is Goodbye and salutation is Hello, Hello.

正解：B

質問 # 127
......

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