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| Section | Objectives |
|---|---|
| Application Development | - Advanced Apex programming
|
| Integration and APIs | - Platform events and messaging
|
| Testing and Deployment | - Deployment lifecycle
|
| Data Modeling and Management | - Advanced data modeling
|
>> Plat-Dev-301 Exam Sample Questions <<
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NEW QUESTION # 89
Refer to the Aura component below:
A developer receives complaints that the component loads slowly. Which change can the developer implement to make the component perform faster?
Answer: B
Explanation:
To improve the performance of an Aura component that is loading slowly, the developer can make the following change:
Lightning Components Performance Best Practices: Improve Performance
D). Change the default for showContactInfo to "False": By setting the default value of showContactInfo to False, the component does not fetch or render the contact information by default, which can reduce the initial load time. The information can be fetched and displayed later based on user action or other triggers.
NEW QUESTION # 90
A developer built an Aura component for guests to self-register upon arrival at a front desk kiosk. Now the developer needs to create a component for the utility tray to alert users whenever a guest arrives at the front desk.
What should be used?
Answer: B
Explanation:
Application Events in Aura components are used for communication between components that are not in the same containment hierarchy. An application event to alert users about the arrival of a guest at the front desk is appropriate because it allows any component within the app to listen and respond to the event, regardless of where it is located in the component hierarchy.
NEW QUESTION # 91
Consider the below trigger intended to assign the Account to the manager of the Account's region:
Which two changes should a developer make in this trigger to adhere to best practices? Choose 2 answers A)
B)
C)
D)
Answer: B,C
Explanation:
The best practices for writing triggers in Salesforce include bulkifying your code to handle multiple records efficiently and reducing the number of SOQL queries, especially within loops, to avoid hitting governor limits.
Option B is correct because moving the SOQL query outside of the for loop is essential to bulkify the trigger. Performing a query within a loop can cause a SOQL governor limit to be reached if the trigger is processing many records. The best practice is to collect all necessary data before the loop starts and then process it within the loop.
Option C is correct as well, because using a Map to cache the results of a SOQL query by Id is another way to bulkify the code. This allows you to query all the necessary data once and then access it efficiently in memory, avoiding repeated queries.
Option A is incorrect because adding isExecuting before the update doesn't address any best practices related to bulkification or SOQL query optimization.
Option D is incorrect because the last line should not be removed if the developer intends to perform DML on the accountList. However, this line should be outside of the loop and is unnecessary if the trigger context is 'before insert' or 'before update', since in those contexts, changes to records in Trigger.new are implicitly saved without the need for explicit DML.
Apex Developer Guide on Triggers: Triggers and Order of Execution
Salesforce Developer Blog on Trigger Best Practices: Trigger Best Practices
NEW QUESTION # 92
Business rules require a Contact ta always be created when a new Account is created.
What can be used when developing a custom screen to ensure an Account is not created if the creation of the Contact fails?
Answer: B
Explanation:
When developing a custom screen that requires both an Account and Contact to be created together, using setSavepoint() and rollback() within a try-catch block is a reliable way to ensure that if the Contact creation fails, the Account creation is also rolled back, maintaining data integrity.
NEW QUESTION # 93
A developer needs to store variables to control the style and behavior of a Lightning Web Component.
Which feature can be used to ensure that the variables are testable in both Production and all Sandboxes?
Answer: C
Explanation:
Custom metadata types are the best feature for storing variables that control style and behavior of a Lightning Web Component. Unlike custom settings, custom metadata is deployable and testable in both Production and all Sandboxes.
NEW QUESTION # 94
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