A Lightning Web Component needs to communicate an event to a grandparent component that is several levels up in the DOM tree. Which mechanism should be used?
A developer is writing an Aura component and needs to handle an event fired by a child component. Which attribute is required in the aura:handler tag on the parent component?
An LWC component uses a wire adapter to fetch account records. The developer needs to update the parameters passed to the wire adapter dynamically based on user input. How should this be implemented?
A developer is building an Aura component and needs to ensure that a client-side controller method executes after the component's DOM has been fully rendered. Which Aura lifecycle event or method should be utilized?
A developer is creating a Lightning Web Component and needs to style a child component from a parent component across the shadow DOM boundary. What feature enables custom styling hooks?
A developer is building a Visualforce page and wants to execute an action method on the controller when a user clicks a button, without performing a full page reload. Which component should be wrapped around the area to be updated?
A developer wants to prevent sensitive fields from being included in the Visualforce view state to reduce size. Which keyword should be added to the field declaration in the controller?
A developer writes an Apex controller for a Visualforce page and wants to paginate through a large list of records using standard controller methods. Which property should be used?
A developer is configuring a Lightning Web Component to be used as a Quick Action on a record page. Which target configuration must be added to the component's metadata file?
A developer is creating a Lightning Web Component that needs to display a list of Accounts. The developer wants to fetch the data imperatively when a user clicks a button rather than automatically via a wire adapter. What is the correct approach?
A developer is working with a Visualforce page and wants to display a list of Account records using standard styling that matches the Salesforce Classic UI. Which component should the developer include?
A developer has created a custom Aura component that needs to be embedded within a Lightning Web Component. What is the correct rule regarding component composition between Aura and LWC?
A developer is writing a Lightning Web Component and needs to conditionally render a block of HTML markup based on a boolean property named 'isVisible'. What is the correct syntax in the HTML template?
A developer is working with the Lightning Data Service (LDS) via the @wire decorator to get record data. The record is updated elsewhere in the app, and the developer wants to imperatively refresh the wire data cache. Which function should be called?
A developer is configuring a Lightning Web Component metadata file to allow the component to be placed on a FlexPage. Which tag defines the configuration regions or design properties?
A developer is building a Lightning Web Component and wants to style it using Salesforce Lightning Design System (SLDS). Which TWO statements are true regarding SLDS usage in LWC? (Choose TWO)
A developer is configuring a Lightning Web Component to accept design attributes in the Lightning App Builder. Which THREE files make up a complete LWC bundle that supports App Builder configuration properties? (Choose THREE)
A developer is building a Lightning Web Component that needs to fetch records imperatively based on a user interaction. Which Lightning module should the developer import to access Salesforce data imperatively in JavaScript?
A Lightning Web Component needs to communicate an event up to a grandparent component that is nested two levels above. What is the best practice to achieve this in LWC?
A developer is implementing a Visualforce page that displays a list of accounts and needs to ensure that it adheres to Salesforce security best practices by preventing cross-site scripting (XSS) attacks. Which tag or attribute combination should be used to securely output user-supplied data?
A developer is designing a Lightning Web Component that needs to communicate with another component located anywhere in the application hierarchy, including unrelated components. Which TWO mechanisms are valid and appropriate for this requirement? Choose 2 answers.
A developer is troubleshooting a Lightning Web Component where data retrieved via the @wire service needs to be formatted before being rendered in the template. Which THREE approaches are valid ways to handle or transform wired data? Choose 3 answers.
A developer is building a Lightning Web Component that renders a list of Account records inside an iteration. When a user clicks a row, the component must notify the parent component, which is itself a Lightning Web Component, and the parent must receive the original Account Id in the event detail. The developer writes `this.dispatchEvent(new CustomEvent('accountselected', { detail: { id: account.Id } }));`. Users report that nothing happens when a row is clicked. Which change is required for the parent component to receive the event?
A developer needs to retrieve Salesforce data in a Lightning Web Component without writing imperative Apex. Which module should be imported to use the wire service for standard record data?
A developer creates a custom LWC that wraps child components. The developer needs to pass styling from the parent component into specific slots of the child component. Which CSS selector should be used inside the child component to style content passed into a slot?
A developer wants to style a Lightning Web Component using the Salesforce Lightning Design System (SLDS). What is the recommended way to include SLDS styling?
A developer is building a Lightning Web Component and needs to execute code as soon as the component is inserted into the DOM. Which lifecycle hook should be used?
A developer creates a Lightning Web Component that includes a third-party JavaScript library loaded via a Static Resource. In which lifecycle hook should the third-party library be initialized?
A developer is working with a Lightning Web Component and needs to access a child component's public method from the parent component. How is this achieved?
A developer is building a Visualforce page that uses a custom controller and needs to display a message to the user when an error occurs. Which class and method should be used?
A developer is writing a custom wire adapter or working with custom data in LWC and needs to manually provision data or force a refresh of wire data. Which function should be imported from lightning/uiRecordApi or related wire modules?
A developer needs to configure a Lightning Web Component to be available for use on Lightning Record Pages. Which configuration entry must be present in the component's metadata file (.js-meta.xml)?
A developer wants to conditionally display an HTML element in a Lightning Web Component template based on a boolean property named 'isVisible'. Which directive should be used?
A developer needs to catch unhandled JavaScript errors in a Lightning Web Component hierarchy so the entire app doesn't crash. Which lifecycle hook handles errors thrown by descendant components?
A developer is configuring a Lightning Web Component that uses the Lightning Message Service (LMS). Which module must be imported to publish a message on a message channel?
A developer is writing a Visualforce page with custom controller logic and needs to ensure that database operations are executed transactionally. What happens by default when an unhandled exception occurs during a controller action method?
A developer is implementing a Lightning Web Component that handles drag-and-drop functionality. Which native DOM event is typically intercepted to allow a drop action on an element?
A developer has a Lightning Web Component with a reactive property 'recordId'. How should the property be decorated to ensure it receives the current record ID when placed on a record page?
A developer is building a Lightning Web Component and needs to perform validation on an input field before submission. Which method on a lighting-input element checks validity?
A developer is building a Lightning Web Component and needs to listen to a custom event dispatched by a child component. How is the event listener attached in the parent HTML template?
A developer needs to format a currency value according to the user's locale in a Lightning Web Component HTML template. Which base component should be used?
A developer is working with a Lightning Web Component and needs to ensure reactive updates occur when an object property or array element changes inside a tracked property. What is the correct approach in modern LWC?
A developer creates a Lightning Web Component that consumes data from a wire adapter. The wire adapter returns an object with 'data' and 'error' properties. What is this pattern called in LWC?
A developer is building a Lightning Web Component and needs to navigate to a URL that is external to Salesforce. Which PageReference type should be used with NavigationMixin?
A developer is using the Lightning Message Service and needs to unsubscribe from a message channel when a component is destroyed. In which lifecycle hook should unsubscribe be called?
Which THREE practices are considered security best practices when developing custom Visualforce pages to prevent Cross-Site Scripting (XSS)? Choose 3 answers.
A developer is building a Lightning Web Component and needs to execute code as soon as the component is inserted into the DOM. Which lifecycle hook should the developer use?
A developer needs to pass data from a child Lightning Web Component to a parent Lightning Web Component up the component hierarchy. What is the standard mechanism to achieve this?
A developer is styling a Lightning Web Component using the Salesforce Lightning Design System (SLDS). To ensure the component adheres to the standard styling guidelines for spacing, what should the developer use?
A developer has an Aura component that needs to communicate with an unrelated Lightning Web Component located on the same Lightning page. Which feature should the developer implement?
A developer needs to ensure that a Lightning Web Component can be placed on a Record Page for an Account in the Lightning App Builder. What must be configured in the component's metadata configuration file?
A developer is creating a reusable LWC utility and needs to invoke an Apex method imperatively. The method accepts a record ID parameter. What is the correct way to pass this parameter in JavaScript?
A developer is building a Lightning Web Component that includes a custom wire adapter to fetch custom metadata. The wire adapter needs to react whenever a tracked property changes value. How should the developer wire the property?
A developer is writing a Visualforce page and wants to include standard Salesforce styling and icons. What tag should be added to the top of the Visualforce page?
A developer is troubleshooting a Lightning Web Component where data returned from an Apex wire adapter needs to be mutated before being rendered. What is the correct pattern to handle this?
A developer is writing a Lightning Web Component and needs to load a third-party JavaScript library (such as D3.js) stored as a static resource. Which lifecycle hook is most appropriate for initiating the load using loadScript?
A developer needs to display a toast notification in a Lightning Web Component when a record is successfully saved. Which module should the developer import?
A developer is creating a Visualforce page that overrides the standard Account View action. Which attribute must be included in the <apex:page> tag to ensure standard controller functionality?
A developer needs to create a custom tab for a Lightning Web Component so it can be navigated to from the App Launcher. What type of custom tab must be created?
A developer is building a Lightning Web Component that includes user input fields. To adhere to best practices for accessibility and SLDS form styling, how should form inputs be structured?
A developer creates a parent Lightning Web Component containing a child component. The parent needs to call a public method defined inside the child component. How is this accomplished?
A developer is implementing a custom pagination mechanism in a Lightning Web Component. The component uses an Apex controller method that returns a list of records. Which technique prevents excessive heap size and improves performance when dealing with large datasets?
A developer needs to include a third-party style sheet in a Lightning Web Component. What is the standard way to load CSS styles that are stored as a static resource?
A developer is troubleshooting an issue where a Lightning Web Component is not picking up changes to the internal fields of an object property. What is the cause of this behavior in LWC reactivity?
A developer is writing a Visualforce page that uses a custom controller. The page needs to execute an action method as soon as the page loads, without requiring user interaction. Which attribute on <apex:page> should be used?
A developer is implementing navigation in a Lightning Experience app using the NavigationMixin service in a Lightning Web Component. The developer wants to navigate to a standard ListView for the Account object. What is the correct type to specify?
A developer is creating a Lightning Web Component that needs to interact with Salesforce data using Lightning Data Service. Which TWO wire adapters are natively available in the @salesforce/apex or lightning/ui* modules for basic record operations? (Choose TWO)
A developer is implementing communication in Lightning Web Components. Which TWO mechanisms are valid for passing data or messages between components? (Choose TWO)
A developer is reviewing a Lightning Web Component that makes calls to an Apex controller. Which THREE best practices should be followed when designing the Apex methods for LWC consumption? (Choose THREE)
A developer is troubleshooting lifecycle hooks and rendering behavior in a Lightning Web Component. Which THREE statements are correct regarding LWC lifecycle execution order? (Choose THREE)
A developer is designing a Lightning Web Component that needs to be conditionally displayed in different Salesforce containers. Which TWO targets are valid entries in the component's js-meta.xml configuration file? (Choose TWO)
A developer is creating an Aura component that interacts with Salesforce data. Which TWO tags or features are valid in the Aura framework? (Choose TWO)
A developer is working with component styling and design tokens in Lightning Web Components. Which TWO practices apply when working with SLDS styling in LWC? (Choose TWO)
A developer is implementing error handling for an imperative Apex call in a Lightning Web Component. Which THREE properties or techniques are standard for catching and inspecting errors returned from Apex promises? (Choose THREE)
A developer is utilizing the Lightning Message Service (LMS) to facilitate communication between an Aura component and a Lightning Web Component. Which THREE steps are required to implement LMS successfully? (Choose THREE)
A developer wants to include a custom styling hook to override a standard Lightning Design System component token in a Lightning Web Component. Where should this CSS custom property be defined?
A developer is building a Lightning Web Component that must be made available for use on Lightning Record Pages. Which configuration tag must be included in the component's metadata file?
A developer is working with a Lightning Web Component that uses the @wire decorator to provision data from an Apex method. The Apex method depends on a property that changes dynamically. How should the property be prefixed to signal reactivity to the wire service?
A developer is building a Lightning Web Component that displays a list of contacts for a selected account. The component must call an Apex method that returns contacts, and the developer wants to handle the result using a Promise chain. Which Apex method annotation is required to expose the method to the Lightning Web Component?
A developer is building a Lightning Web Component that displays a toast notification when a user successfully saves a record. Which module should the developer import to use the ShowToastEvent?
A developer is creating a Lightning Web Component that needs to conditionally render a section based on a boolean property. The property is initially false and is set to true after data is loaded from an Apex method. Which approach should the developer use to ensure the section renders only when the property is true?