Salesforce Updated PDI Exam Questions and Answers by mckenzie

In a before insert trigger:

Trigger.old is null.

There is no existing record in the database to reference.

Why Not Other Options:

Option A: Describes Trigger.new.

Option B: The variable is defined but has a null value.

Option D: Trigger.old is not an empty list; it is null.

References:

Trigger Context Variables:

"In insert triggers, Trigger.old is null because the records are new."— Apex Developer Guide: Trigger Context Variables

Universal Containers wants to prevent Opportunities from being edited once they reach the Closed/Won stage. To achieve this, the developer can use the following strategies:

Option A: Use a validation rule.

Correct Approach.

Explanation:

A validation rule can be created on the Opportunity object to prevent users from editing records when the Stage is Closed/Won.

The validation rule would evaluate whether the record's StageName is 'Closed Won' and, if so, display an error message when a user attempts to edit and save the record.

Example Validation Rule:

AND(

ISPICKVAL(StageName, 'Closed Won'),

ISCHANGED(ANYFIELD) // Replace ANYFIELD with specific fields if needed

)

Benefits:

Declarative Solution: No code required.

Consistent Enforcement: Applies across all user interfaces and API.

To fire an exception in Apex, the developer must use the throw statement along with an instance of the exception.

Option A: throw new ParityException();

Correct Way.

Explanation:

Creates a new instance of ParityException with no message and throws it.

Syntax is correct for throwing an exception.

Option C: throw new ParityException('parity does not match');

Correct Way.

Explanation:

Creates a new instance of ParityException with a custom message and throws it.

The exception class inherits from Exception, which allows passing a message to the constructor.

Options Not Correct:

Option B: new ParityException('parity does not match');

Incorrect.

Explanation:

This statement creates a new instance of ParityException but does not throw it.

Without the throw keyword, the exception is not fired.

Option D: new ParityException();

Incorrect.

Explanation:

Similar to Option B, this creates a new instance but does not throw it.

The exception will not affect the flow unless it is thrown.

Conclusion:

The two ways the developer can fire the exception are:

Option A: throw new ParityException();

Option C: throw new ParityException('parity does not match');

Both use the throw statement to fire the exception.

In an Aura component, JavaScript functions can be included in the following resources:

Controller (.js file):

Handles events triggered by user interaction or component lifecycle.

Contains action handlers defined in the component's markup.

"A client-side controller contains the handler functions that are called in response to events fired by the component or other components."— Aura Components Developer Guide: Client-Side Controller

Helper (.js file):

Contains reusable functions that can be called from the controller or renderer.

Helps to keep the controller lean by abstracting complex logic.

"A helper JavaScript resource can be added to an Aura component bundle and is used to store helper functions that can be reused in the component's client-side code."— Aura Components Developer Guide: Helper Functions

Renderer (.js file):

Allows for custom rendering behavior.

Contains methods that can override default rendering lifecycle events.

"A renderer component bundle resource allows you to customize the rendering behavior of a component."— Aura Components Developer Guide: Custom Renderers

Why Other Options Are Incorrect:

C. Style:

The .css file in an Aura component is used for styling and cannot contain JavaScript functions.

"An Aura component or application can have a style (CSS) resource to define its styles."— Aura Components Developer Guide: Style

E. Design:

The .design file is used to define metadata values for the component, especially when used in Lightning App Builder or Community Builder.

"A design resource describes the design-time behavior of an Aura component—information that visual tools need to display the component in a page or app."— Aura Components Developer Guide: Design Files

Conclusion: JavaScript functions in an Aura component can be placed in the Controller, Helper, and Renderer resources. Therefore, the correct answers are A, B, and D.