Plat-Dev-301試験復習、Plat-Dev-301復習攻略問題

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Salesforce Plat-Dev-301 Exam Syllabus Topics:

Section	Weight	Objectives
Performance and Data Management	18%	- Governor limits optimization and best practices - Optimize queries and handle large data volumes - Data modeling and complex data operations
Logic, Process Automation, and Integration	27%	- Complex business logic and automation design - REST/SOAP API, Platform Events, and external integrations - Asynchronous Apex: future, queueable, batch, scheduled - Advanced Apex programming and transaction management
Testing, Debugging, and Deployment	20%	- Deployment strategies, CI/CD, and change management - Debugging and error handling across layers - Advanced testing strategies and test frameworks
Advanced Developer Fundamentals	15%	- Apply security best practices in development - Design and maintain scalable, reusable code - Work with localization, multi-currency, and global features
User Interface Development	20%	- Implement advanced Visualforce functionality - Optimize UI performance and usability - Build complex Lightning Web Components and Aura Components

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Plat-Dev-301復習攻略問題 & Plat-Dev-301前提条件

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Salesforce Certified Platform Developer II - Multiple Choice 認定 Plat-Dev-301 試験問題 (Q126-Q131):

質問 # 126
A developer is creating a Lightning web component that displays a list of records in a lightning-datatable. After saving a new record to the database, the list is not updating.

What should the developer change in the code above for this to happen?

A. Call rafrasnApex() ON this.dazta.
B. Create a variable to store the result and call refreshpex().
C. Add the @track decorator to the data variable.
D. Create a new variable to store the result and annotate it with @track.

正解：B

解説：
In Lightning Web Components (LWC), the data displayed in a component is not automatically refreshed when a new record is saved to the database. To refresh the displayed list of records in a lightning-datatable after a save operation, developers should use the refreshApex() function. This function is imported from the @salesforce/apex module and is used to refresh the cache and re-execute the Apex wire method to fetch the latest data from the server. The @track decorator is no longer necessary in most cases due to reactive properties being the default behavior in LWC as of Spring '20 release. Also, calling refreshApex() on this.data directly or creating a new tracked variable will not initiate a refresh of the cached data.
ferences:
Get Updated Data with refreshApex()
Lightning Web Components and Salesforce Data

質問 # 127
A Lightning web component exists in the system and displays information about the record in context as a medal. Salesforce administrators need to use this component within the Lightning App Builder, Which two settings should the developer configure within the xml resource file?
Choose 2 answers

A. Specify the target to be lightning_RecordPage
B. Set the IsVisible attribute to true
C. Specify the target to be lightning_AppPage
D. Set the IsExposed=d attribute to true.

正解：A、D

解説：
To make a Lightning web component available in the Lightning App Builder, the developer must specify the target where the component can be placed (e.g., record pages) in the .xml file and set the isExposed attribute to true. Expose Lightning Web Components for Flow Screens, Quick Actions, App Builder, and Experience Builder

質問 # 128
Consider the following code snippet:

As part of the deployment cycle, a developer creates the following test class:

When the test class runs, the assertion fails. Which change should the developer implement in the Apex test method to ensure the test method executes successfully? A)

B)

C)

D)

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

正解：B

解説：
To ensure that test methods execute successfully and are able to verify the behavior of the code, it is important to set up the proper context and to make sure that the test covers the expected outcomes accurately.
Option B is correct because enclosing the method call within Test.startTest() and Test.stopTest() ensures that any asynchronous operations are completed before the assertions are made. This is crucial when the code being tested is expected to perform operations that may run after the initial transaction, such as future methods, queueable jobs, or batch operations.
Options A, C, and D are incorrect because they do not address the issue of ensuring that all operations are completed before the assertion is made. Option A incorrectly suggests modifying the test setup code, while Options C and D suggest changes that are not related to the test execution flow.
Salesforce Developer Documentation on Testing Best Practices: Apex Testing Best Practices

質問 # 129
Refer to the following code snippet:

A developer created a JavaScript function as part of a Lightning web component (LWC) that surfaces information about Leads by wire calling geyFetchLeadList whencertain criteria are met. Which three changes should the developer implement in the Apex class above to ensure the LWC can display data efficiently while preserving security? Choose 3 answers

A. Annotate the Apex method with @AuraEnabled(Cacheable=True).
B. Annotate the Apex method with @AuraEnabled.
C. Implement the with sharing keyword in the class declaration.
D. Use the WZ E D clause within the SOQL query.
E. Implement the with keyword in the class declaration.

正解：A、B、C

解説：
The Apex class needs to have the method annotated with @AuraEnabled to expose it to the LWC. The 'with sharing' keyword ensures that the data access is enforced according to the user's permissions. @AuraEnabled(cacheable=true) allows client-side caching for improved performance.
@AuraEnabled Annotation: Apex Developer Guide
Enforcing Sharing Rules: Apex Developer Guide

質問 # 130
Universal Containers develops a Salesforce application that requires frequent interaction with an external REST API.
To avoid duplicating code and improve maintainability, how should they implement the APL integration for code reuse?

A. Store the APT integration code as a static resource and reference it in each Apex class.
B. Include the API integration code directly in each Apex class that requires it.
C. Create a reusable Apex class for the AFL integration and invoke it from the relevant Apex classes.
D. Use a separate Apex class for each API endpoint to encapsulate the integration logic,

正解：C

解説：
Creating a reusable Apex class for API integration allows for code encapsulation and maintainability. This class can then be invoked from any other Apex class that requires interaction with the API, preventing code duplication.

質問 # 131
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