SF-PD2 User Interface Practice Question

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

• ✗

  import { ToastEvent } from 'lightning/notifications';

  Why it's wrong here

  The lightning/notifications module is used for subscribing to and unsubscribing from notifications, not for displaying toast messages. It does not export ToastEvent. A developer might confuse notifications with toasts because both alert users, but only the platformShowToastEvent module provides the event needed to display a toast in this component.

• ✗

  import Toast from 'lightning/toast';

  Why it's wrong here

  There is no standard Lightning Web Component module named lightning/toast that exports a Toast class for showing notifications. A developer might assume a simpler toast API exists, but the supported mechanism is ShowToastEvent from lightning/platformShowToastEvent. Importing a non-existent module would cause a compilation error, so this cannot satisfy the requirement.

• ✗

  import { showToast } from 'lightning/uiRecordApi';

  Why it's wrong here

  The lightning/uiRecordApi module provides wire adapters and functions such as getRecord, createRecord, and updateRecord for working with record data. It does not export a toast function. Using it here would fail because the named import does not exist, and it would not render any notification to the user regardless of the Apex error code returned.

• ✓

  import { ShowToastEvent } from 'lightning/platformShowToastEvent';

  Why this is correct

  Lightning Web Components display toasts by dispatching a ShowToastEvent, which is imported from the lightning/platformShowToastEvent module. This module is the standard, supported way to show a toast from an LWC, and it works consistently in Lightning Experience on desktop and in the Salesforce mobile app, which matches the cross-platform requirement in this scenario.