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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Integration | 15% | - External Services and Connect REST API - Named Credentials and authentication - Platform Events and Change Data Capture - REST and SOAP web services (Apex callouts) |
| Topic 2: User Interface | 18% | - Lightning Web Components (LWC) advanced features - Aura Components - Lightning Data Service - Visualforce advanced controllers |
| Topic 3: Architecture | 18% | - Governor limits and bulkification - Design patterns and Apex trigger frameworks - Namespace and package management - Apex Enterprise Patterns |
| Topic 4: Testing, Debugging, and Deployment | 15% | - Deployment tools (SFDX, Metadata API) - Apex unit testing best practices - Debugging and performance profiling - Test data strategies and mocking |
| Topic 5: Data Modeling | 12% | - Large data volumes considerations - Advanced object relationships and data modeling - External objects and data sources |
| Topic 6: Logic and Process Automation | 22% | - Dynamic Apex and SOQL/SOSL - Asynchronous Apex (Batch, Queueable, Future, Scheduled) - Advanced Apex programming - Invocable Actions and Platform Events |
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NEW QUESTION # 199
What are three reasons that a developer should write Jest tests for Lightning web components?
Choose 3 answers
Answer: A,B,D
Explanation:
Jest tests are essential for developing Lightning Web Components (LWC) because they allow developers to ensure the quality and correctness of their components in isolation from the rest of the application. Reason A is incorrect because testing non-public properties breaks encapsulation and is considered bad practice. B is correct because Jest tests can simulate user interactions with the component, such as clicking buttons or entering text, to ensure it behaves as expected. C is correct as well because Jest tests can confirm that the component renders the expected DOM output, which is crucial for ensuring that the HTML structure of the component is accurate. D is not the best choice since Jest is more suited for testing components in isolation rather than how multiple components interact; integration tests are more appropriate for that. Lastly, E is correct because Jest tests can verify that events are fired at the appropriate times, which is a critical part of the component's interaction with the rest of the application.
Reference
Jest Testing: Lightning Web Components Testing
Jest Testing Best Practices: Lightning Web Components Jest Best Practices
NEW QUESTION # 200
The head of recruiting at Universal Containers (UC) wants to provide all internal users the ability to search for open positions by role, department, and location via a new recruiting app. In addition to search, users of the app should be able to refer a friend, apply for a position, and review the status of their current submissions.
The app will be surfaced to UC's existing iOS and Android users via the standard mobile app that Salesforce provides. It has a custom user interface design and offline access is not required.
Given these requirements, what is the recommended approach to develop the app?
Answer: B
NEW QUESTION # 201
Refer to the markup below:
A Lightning web component displays the Account name and two custom fields out of 275 that exist on the abject. The custom fields are correctly declared and populated. However, the developer receives complaints that the component performs slowly. What can the developer do to improve the performance?
Answer: A
Explanation:
To improve performance, the developer should specify only the fields needed by using the fields attribute in the lightning-record-form instead of loading all fields with layout-type="Full". This reduces the amount of data being retrieved and processed, thus improving the component's performance.
NEW QUESTION # 202
A developer is building a Lightning web component that searches
for Contacts. The component must communicate the search
results to other unrelated Lightning web components, that are in
different DOM trees, when the search completes.
What should the developer do to implement the communication?
Answer: D
Explanation:
For communication between unrelated Lightning web components that are in different DOM trees, the most suitable approach is to use the Lightning Message Service (LMS). This service allows components to communicate with each other using a message channel, which is particularly useful when the components are not in the same containment hierarchy. By publishing and subscribing to messages on a message channel, components can exchange data and notifications, which is ideal for the scenario described.
Lightning Web Components Developer Guide - Communicate Across the DOM with Lightning Message Service
NEW QUESTION # 203
A developer created an Apex class that updates an Account based on input from a Lightning web component that Is used to register an Account. The update to the Account should only be made if it has not already been registered.
What should the developer do to ensure that users do not overwrite each other's updates to the same Account if they make updates at the same time? A)
B)
C)
D)
Answer: A
Explanation:
When multiple users are updating the same record at the same time, there is a risk of overwriting each other's changes. Salesforce provides a mechanism called 'record locking' to prevent this from happening.
Option D is correct because including FOR UPDATE in the SOQL query locks the retrieved records for the duration of the transaction. This prevents other transactions from updating the record until the current transaction is complete, which is essential for avoiding race conditions where two users might overwrite each other's updates.
Option A is incorrect because while adding a try/catch block around the update operation is good practice for handling exceptions, it does not prevent overwrites from concurrent updates.
Option B is incorrect because using upsert instead of update does not address the problem of concurrent updates. The upsert operation is used to either insert a new record or update an existing one based on whether a record with a matching ID or external ID already exists.
Option C is incorrect because FOR UPDATE should be used in the SOQL query to lock the records, not in the SELECT statement itself.
Salesforce Developer Documentation on Locking Statements: Locking Statements Salesforce Developer Blog on Handling Concurrency in Apex: Handling Concurrency in Apex
NEW QUESTION # 204
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