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| Section | Weight | Objectives |
|---|---|---|
| User Interface Development | 20% | - Optimize UI performance and usability - Implement advanced Visualforce functionality - Build complex Lightning Web Components and Aura Components |
| Logic, Process Automation, and Integration | 27% | - Asynchronous Apex: future, queueable, batch, scheduled - Complex business logic and automation design - Advanced Apex programming and transaction management - REST/SOAP API, Platform Events, and external integrations |
| Performance and Data Management | 18% | - Governor limits optimization and best practices - Optimize queries and handle large data volumes - Data modeling and complex data operations |
| Advanced Developer Fundamentals | 15% | - Work with localization, multi-currency, and global features - Apply security best practices in development - Design and maintain scalable, reusable code |
| Testing, Debugging, and Deployment | 20% | - Deployment strategies, CI/CD, and change management - Advanced testing strategies and test frameworks - Debugging and error handling across layers |
>> Valid Salesforce Plat-Dev-301 Test Questions <<
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NEW QUESTION # 152
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?
Answer: B
Explanation:
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
NEW QUESTION # 153
A Salesforce developer is hired by a multi-national company to build a custom Lightning application that shows employees their employment benefits and earned commissions over time. The application must acknowledge and respect the user's locale context for dates, times, numbers, currency, and currency symbols.
When using Aura components, which approach should the developer implement to ensure the Lightning application complies with the user's locale?
Answer: A
Explanation:
The $Locale value provider should be used to ensure the Lightning application respects the user's locale for dates, times, numbers, currency, and currency symbols. This global value provider gives components access to locale formats and labels, which are automatically rendered according to the user's locale settings.
NEW QUESTION # 154
A developer is tasked with ensuring that email addresses entered into the system for Contacts and for a custom object called survey Response c do not belong to a list of blocked domains.
The list of blocked domains is stored in a custom object for ease of maintenance by users. The survey Response c object is populated via a custom Visualforce page.
What is the optimal way to implement this?
Answer: C
Explanation:
The optimal way to enforce the exclusion of blocked domains for email addresses entered into Contacts and a custom object is to use a helper class. The class can be called by an Apex trigger on the Contact object and from the controller of the custom Visualforce page used for the Survey Response. This centralizes the logic for maintainability and reusability.
NEW QUESTION # 155
A developer gets an error saying 'Maximum Trigger Depth Exceeded.'
What is a possible reason to get this error message?
Answer: C
Explanation:
The "Maximum Trigger Depth Exceeded" error message is typically caused by a trigger being recursively invoked too many times. Salesforce has a limit on the depth of trigger recursion to prevent infinite loops, which is 16 times.
NEW QUESTION # 156
A developer is asked to modify a Lightning web component so that it displays in one column on phones and in two columns on tablets, desktops, and larger devices.
Given to the code below:
Which should the developer add to the code to meet the requirements? A)
B)
C)
D)
Answer: D
Explanation:
The requirement is for the Lightning web component to display in one column on phones and in two columns on larger devices. To achieve this, we should specify the size attributes for different devices using the design tokens provided by the Lightning Design System.
Option B is correct because size="6" will set each lightning-layout-item to take up half the available space (since the grid system is based on a 12-column structure), creating two columns on tablets, desktops, and larger devices. small-device-size="12" will ensure that on small devices like phones, each item will take up the full width, resulting in a single column.
Options A, C, and D do not meet the requirement correctly, as they either do not set the size correctly for small devices or do not specify the sizes for both small and larger devices appropriately.
Lightning Design System Grid Documentation: Lightning Grid
NEW QUESTION # 157
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