PD1 Lightning Components 5

Question 1

Which metadata file controls where a Lightning Web Component can be used (e.g., App Page, Record Page)?

Accepted Answer

componentName.js-meta.xml

Answer

The .js-meta.xml configuration file defines the component's targets (page types), isExposed setting, and properties visible in Lightning App Builder.

Question 2

In LWC, which decorator is used to consume data from a wire adapter or Apex method reactively?

Accepted Answer

@wire

Answer

@wire connects a component property or function to a wire adapter, automatically re-provisioning data when reactive properties change.

Question 3

What happens when you change a primitive value exposed via @api from the parent component in LWC?

Accepted Answer

The component re-renders automatically because @api properties are reactive

Answer

Primitive @api properties are reactive by default in LWC, so changing them from the parent automatically triggers a re-render of the child component.

Question 4

In Aura components, what is the correct way to access a child component's method marked with `aura:method`?

Accepted Answer

Use this.find('auraId').methodName()

Answer

In Aura, this.find('auraId') retrieves a reference to a child component by its aura:id, and you can then call any aura:method defined on it.

Question 5

Which LWC template directive conditionally renders a block of HTML based on a boolean expression?

Accepted Answer

Both A and B are valid in current LWC versions

Answer

LWC supports both the older if:true/if:false directives and the newer lwc:if/lwc:elseif/lwc:else directives introduced in API version 55.

(PD1) Salesforce Certified Platform Developer 1 Practice Test