Given a Set of Requirements, Describe the Process for Designing Lightning Components. PLATFORM-DEVELOPER-II Practice Questions (Page 1)

Questions 1–5

1. 1application · medium

   A developer is designing a Lightning component that will be used by users with visual impairments. The component includes a custom button that is not a standard SLDS component. What is the most important accessibility consideration?

   • AEnsure the button has a descriptive label and is keyboard accessible.
   • BUse a bright color for the button to make it visible.
   • CAdd a tooltip to the button to provide additional information.
   • DUse a larger font size for the button text.
   Reveal Solution Discussion Select an answer first
2. 2expert · hard

   A Lightning component calls an Apex method that performs a complex calculation and returns a result. The developer wants to ensure the method is reliable and maintainable. Which practice is most important?

   • AWrite Apex unit tests that cover the calculation logic, including edge cases.
   • BUse a wire adapter to call the Apex method, which provides automatic caching.
   • CUse a custom label to store the calculation logic.
   • DAdd debug statements in the Apex method to trace the calculation.
   Reveal Solution Discussion Select an answer first
4. 3application · medium

   A Lightning component displays a list of records and allows users to filter by a picklist value. The component currently loads all records and filters client-side. The list is expected to grow significantly. What is the best way to optimize performance?

   • AKeep the current approach but add a loading spinner.
   • BLoad all records once and cache them in a static variable.
   • CUse a custom Apex method to filter the records and return only the necessary fields.
   • DUse a wire adapter with a filter parameter to load only the filtered records from the server.
   Reveal Solution Discussion Select an answer first
5. 4foundation · easy

   Which mechanism is used to communicate from a child component to a parent component in Lightning?

   • ACalling a method on the parent component
   • BSetting an attribute on the parent component
   • CUsing a global variable to share data
   • DFiring a component event
   Reveal Solution Discussion Select an answer first
6. 5foundation · easy

   What is the purpose of the callback function in an Apex method call from a Lightning component?

   • ATo define the Apex method's parameters
   • BTo handle the response from the server asynchronously
   • CTo make the Apex call synchronous
   • DTo set the Apex method's return type
   Reveal Solution Discussion Select an answer first