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Salesforce Certified Platform Developer I Sample Questions (Q175-Q180):

NEW QUESTION # 175
Which action can a developer perform in a before update trigger? (Choose 2)

A. Display a custom error message in the application interface.
B. Delete the original object using a delete DML operation.
C. Change field values using the Trigger.new context variable.
D. Update the original object using an update DML operation.

Answer: A,C

NEW QUESTION # 176
A developer needs to make a custom Lightning Web Component available in the Salesforce Classic user interface.
Which approach can be used to accomplish this?

A. Embed the Lightning Web Component is a Visualforce Component and add directly to the page layout.
B. Wrap the Lightning Web Component In an Aura Component and surface the Aura Component as a Visualforce tab.
C. Use a Visualforce page with a custom controller to invoke the Lightning Web Component using a call to an Apex method.
D. Use the Lightning Out JavaScript library to embed the Lightning Web Component in a Visualforce page and add to the page layout.

Answer: D

Explanation:
The approach that can be used to make a custom Lightning Web Component available in the Salesforce Classic user interface is to use the Lightning Out JavaScript library to embed the Lightning Web Component in a Visualforce page and add to the page layout. Lightning Out is a feature that allows developers to use Lightning web components and Aura components outside the Lightning Experience and Salesforce app, such as in Visualforce pages, standalone apps, or external websites. By using Lightning Out, developers can leverage the benefits of Lightning Web Components, such as performance, interoperability, and modern web standards, in the Salesforce Classic user interface. To use Lightning Out, developers need to create a Lightning dependency app, which is a special type of Aura app that acts as a bridge between the Lightning web component and the Visualforce page. Then, developers need to use the $Lightning.use() and
$Lightning.createComponent() methods in the Visualforce page to load the dependency app and create an instance of the Lightning web component. Finally, developers need to add the Visualforce page to the page layout of the object where they want to display the Lightning web component. References: Use Lightning Web Components in Visualforce Pages, Lightning Out, Free Salesforce Platform Developer 1 Practice Exam (With Answers)

NEW QUESTION # 177
What are two valid options for iterating through each Account in the collection List<Account> named AccountList? (Choose two.) for (Account theAccount :

A. for (List L : AccountList) {...}
B. for (Integer i=0; i < AccountList.Size(); i++) {...}
C. AccountList) {...}
D. for(AccountList) {...}

Answer: B,C

NEW QUESTION # 178
A developer considers the following snippet of code:

Based on this code, what is the value of x?

A. 0
B. 1
C. 2
D. 3

Answer: D

NEW QUESTION # 179
Which Lightning Web Component custom event property settings enable the event to bubble up the containment hierarchy and cross the Shadow DOM boundary?

A. bubbles: true, composed: false
B. bubbles: false, composed: false
C. bubbles: false, composed: true
D. bubbles: true, composed: true

Answer: D

Explanation:
To enable a custom event in a Lightning Web Component (LWC) to bubble up the containment hierarchy and cross the Shadow DOM boundary, the event must be dispatched with the properties:
bubbles: true
composed: true
bubbles Property:
When set to true, the event bubbles up through the DOM hierarchy, allowing parent components to listen for the event.
"The bubbles option indicates whether the event bubbles up through the DOM or not."
- Lightning Web Components Developer Guide: Event Propagation
composed Property:
When set to true, the event can pass through the Shadow DOM boundary, allowing components outside the Shadow DOM to receive the event.
"The composed option controls whether the event can propagate across the boundary between the shadow DOM and the regular DOM."
- Lightning Web Components Developer Guide: Event Composition
Example:
// ChildComponent.js
const event = new CustomEvent('myevent', {
bubbles: true,
composed: true,
detail: { /* event data */ }
});
this.dispatchEvent(event);
Why Other Options Are Incorrect:
Option B: bubbles: true, composed: false
The event will bubble up within the Shadow DOM but will not cross the Shadow DOM boundary.
Option C: bubbles: false, composed: false
The event will neither bubble nor cross the Shadow DOM boundary, limiting its propagation.
Option D: bubbles: false, composed: true
The event will not bubble up the containment hierarchy but can cross the Shadow DOM boundary, which is insufficient for the requirement.
Conclusion:
Setting both bubbles and composed to true ensures the event bubbles up through the component hierarchy and crosses the Shadow DOM boundary.

NEW QUESTION # 180
......

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