SalesForce Lightning Interview Questions

Are you preparing for a job interview? Examine these top Salesforce Lightning interview questions and answers to land your ideal sales specialist position. Recognizing bespoke items, the Salesforce dashboard components, Platform Force.com Visualforce, Salesforce report on Object Search Language vs. Object Query Language kinds, Salesforce Apex, Salesforce Lightning, and much more are included in this list of interview questions.

Salesforce lightning is an application development framework designed by salesforce.com; it simplifies business users' procedures. Lightning experience is an enhanced interface with the latest features and updated pages for speeding the sales process to increase your business. 

Lightning has all the technology and tools to update the Salesforce platform. Many leading firms, including Adidas, Cisco Systems, Motorola Inc, and Allianz AG, use salesforce lightning to complete company activities and strengthen customer relationships because of its out-of-the-box component set and broad ecosystem. 

As a result, numerous work possibilities for certified salesforce lightning professionals are available everywhere.

The Set is divided into 2 parts

• For Freshers
• For Professionals

Most Frequently asked Salesforce Lightning Interview Questions Why is LWC more powerful than aura? How many Apex methods can you invoke in LWC? What exactly is the Lightning Framework?  What exactly is Lightning Data Service? What exactly is Lightning Out? What is the meaning of Namespace in Salesforce Lightning components? What exactly is FlexiPage? What is the difference between an action and value providers?  What is the use of the meta configuration file in the LWC?

Salesforce Lightning Interview Questions and Answers:

1) What is the distinction between aura and LWC?

Ans: Aura and LWC are two prominent frameworks for building web apps. Aura is a framework for designing components that may be used in any online application. LWC is a framework for developing Lightning Web Components, or components designed to work with the Lightning platform.

2) Is Lightning a framework for MVC?

Ans: The Lightning Components framework uses the Model, View, Controller (MVC) paradigm. The component file provides the view layer, the JS controller and helper files offer the controller part, and the controller interacts with the Salesforce server using Apex.

3) Why do we use @AuraEnabled in LWC? 

Ans: The @AuraEnabled annotation gives client-side and server-side access to an Apex controller method. Providing this annotation makes your methods visible to your Lightning components (both Lightning web components and Aura components). Only methods marked with this annotation are visible.

4) Why is LWC more powerful than aura?

Ans: Faster Sites & Better Performance: Because LWC is a lightweight framework built on web standards, and there is no additional abstraction layer, LWC is likely to render faster than aura components, which is vital for deliverability.

5) Is LWC and lightning the same thing?

Ans: Aura-based Although Lightning components are constructed with HTML and JavaScript, LWC is built entirely on the Web stack. A developer that works on LWC employs coding talents in one framework and others based on the Web Stack, such as React or Angular.

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6) Which framework is utilised in lightning?

Ans: The open-source Aura framework serves as the foundation for the Lightning Component framework. The Aura framework allows you to create apps that are not dependent on your Salesforce data.

7) Is LWC an MVC?

Ans: The Salesforce LWC follows MVC architecture, like most full-stack modern web development technologies, however, it differs from typical MVC architecture in that there are two controllers instead of one: Client-side JavaScript controller. Apex controller on the server.

8) How many Apex methods can you invoke in LWC?

Ans: There are two ways to call the Apex method from Lightning Web Component: Use the apex method. Wire services are being used. Call the apex method without hesitation.

9) What is the use of @wire in LWC?

Ans: When you wish to consume the data or error as-is, wiring a property is useful. If the @wire property is used as an attribute in the template and its value changes, the wire service supplies the data and causes the component to redraw.

Checkout: [Salesforce vs Demandware]

10) What are LWC lifecycle hooks?

Ans: Lifecycle Hooks are callback methods that are invoked at a certain point in the lifecycle of a component instance. A hook method informs us that something occurred, which may or may not be present on the prototype chain. LWC contains a total of six lifecycle hooks.

Salesforce Lightning Interview Questions for Freshers:

1) What is Salesforce Lightning?

Ans: Salesforce Lightning is a salesforce.com app development framework that streamlines business processes for users.

2) What exactly is the Lightning Framework?

Ans: The Lightning Component Framework is a UI Framework from Salesforce that is used to construct single-page applications for desktop and mobile devices. Lightning Components can be created using either the Aura Components Model or the Lightning Web Components Model.

3) What are the Salesforce Lightning components?

Ans: Salesforce Lightning is made up of the following parts:

• Lightning Component Framework - It is a javascript framework and a set of general components that allow the building of recyclable components for personalising the Salesforce1 Mobile App and Lightning Experience
• Lightning Experience is Salesforce's fresh and modern user experience and interface.
• Lightning Exchange - It relates to a part of AppExchange, which has over 70 partner components to start the development process
• Lightning Design System - It allows you to create applications with the look and feel of Lightning Experience without having to write a single word of CSS. – It refers to drag-and-drop functionalities that allow for simple and quick customization and app development.

4) What exactly is Lightning Experience?

Ans: The latest Salesforce desktop application is called Lightning Experience.

5) What is the use of aura: namespace?

Ans: Aura: namespace includes all of the fundamental building pieces for defining applications and components.

6) What are the various sorts of events generated by Salesforce Lightning components?

Ans: The three events of Salesforce Lightning components are as follows:

• Salesforce fires system events throughout the Lightning app lifetime.
• Application Event: It follows a typical publish-subscribe model and is fired from an instance of a component. All components that provide an event handler are alerted.
• Component Event: A component event is fired from a component instance and processed by the component that fired the event or a component in the containment hierarchy that receives the event.

7) What exactly is Lightning Data Service?

Ans: Lightning data service is used for carrying out fundamental actions like creating, modifying, loading, or removing a record in a component without Apex code. It handles sharing rules and field-level security. Lightning data service improves performance, consistency, and user interface.

8) What exactly are the Lightning component bundles?

Ans: The component bundles of the Lightning components are as follows:

• Controller: It is in charge of client-side events.
• Documentation: This component bundle is used to track the component's usage.
• Style: It includes component design.
• Renderer: It includes a default rendering behavior component.
• Helper: To prevent redundancy, general logic can be written in this component bundle, which is used by many controller methods.

9) How can we integrate Lightning components into the Salesforce1 Mobile App?

Ans: Lightning Components can be utilised with the Salesforce1 mobile app by adding a regular Lightning tab referencing the component. This tab can be included in the Salesforce1 mobile navigation.

10) What are the various sorts of Lightning Record pages and how are they created?

Ans: Lightning record pages come in three varieties: record page, app page, and homepage, and they can all be created with Lightning App Builder.

11) What exactly is Lightning Out?

Ans: If a component must be used on an external site, lightning out is employed. The advantage is that Lightning components can be utilised in a visual force page. When it comes online, nothing beats the power of the internet.

Related Article: Annotations in Salesforce

12) How can we incorporate a Lightning component into a VisualForce Page?

Ans: The use of Lightning Out can aid in the embedding of the Lightning component on the VisualForce page. It can be performed in three steps:

• The Lightning components for the javascript library of visual force must be first introduced into the intended visual force page through the tag.
• A Lightning app that is used for the component dependencies is then generated and pointed.
• Finally, a javascript code that generates the component over the page using $Lightning. create component must be constructed ().

13) What is the distinction between a component and an application event?

Ans: Component event is used for interaction between the parent and kid. The component event can be used to convey changes in the child component to the parent component.

Application events are used to broadcast changes to a large number of people. The components that have registered for this event will get an alert.

14) What is the meaning of Namespace in Salesforce Lightning components?

Ans: The Namespace is used to gather together components and can be formed by an organisation. A namespace contains the Lightning components. The default namespace is C.

If a namespace is defined for an organisation, it can be used by the Lightning components.

15) The term "electronic commerce" refers to the sale of electronic goods.

Ans: Lightning components can be utilised in the following places:

• Dragging and dropping them in the community builder and Lightning App Builder
• It has been added to the Lightning pages.
• Begin with rapid action.

Salesforce Lightning Interview Questions for Professionals:

1) In the context of Salesforce Lightning, distinguish between component events and application events.

Ans: Component events serve as a conduit for communication between a parent and a child. A change in the child component can be sent to the parent component using Component Events.

Application Events notify a much larger audience about changes to the component. The modification is communicated to all components that have registered for the event.

2) Differentiate between Salesforce Classic and Salesforce Lightning.

Ans:

• Salesforce Lightning features an upgraded user interface.
• You need to engage a Salesforce Developer to manage Salesforce Classic, but Salesforce Lightning is considerably easier to work with.
• You don't require Visualforce for every task if you're using Lightning.
• Salesforce Lightning provides more advanced security features than Salesforce Classic.
• Lightning users can get Einstein (Wave) Analytics Reporting. A feature that Classic does not have.

3) What exactly are component events?

Ans: Component events are dismissed by child components and handled by parent components. Component events are employed when a value from the child component needs to be transmitted to the parent component.

4) What exactly are Application Events?

Ans: Any component can dismiss and handle application events. It does not require any form of relationship among the members. These components should be a part of one application.

5) What are the various stages of application event propagation?

Ans:

• Default Phase 
• Capture Phase
• Bubbles Phase II.

6) What is Lightning App Builder?

Ans: The Lightning App Builder is a point-and-click tool for building Lightning pages for mobile apps and the Salesforce Lightning Experience. Lightning pages are created using programmable, reusable, and compact Lightning components. The Lightning App Builder can assist in the creation of a home page, app page, and record page.

Also read: Loops in Salesforce

7) What is the difference between bound and unbound expressions?

Ans: To achieve data binding, unbound and bound expressions are utilized. When a child component is called from the parent component, the value can be passed from the attribute of a parent component to a child component attribute.

8) What are the many sorts of attributes that can be used to store values?

Ans: For storing values, the following properties are used:

• Boolean
• Integer 
• String 
• Datetime
• Date
• Decimal 
• Map 
• Set

9) What role does the aura: method tag play in Salesforce Lightning?

Ans: The aura: method is used for specifying the method within the API of the component. Instead of processing or dismissing an event, this allows a method to be immediately executed in the client-side controller of a component.

The aura: method> can assist in simplifying the code required by the parent component to call a method on the child component.

10) What exactly is FlexiPage?

Ans: FlexiPage displays the metadata associated with a Lightning page. The Lightning page displays an adaptable screen comprised of sections containing Lightning components. The Lightning page comprises 25 components.

The Flexi page is saved as an XML file and distributed by a deployment tool or the Salesforce metadata API. In the API, Lightning pages are referred to as Flexipages.

11) What is Salesforce Lightning Locker?

Ans: The Lightning Locker service provides a strong and effective security architecture for the Lightning components. It improves security by separating Lightning components belonging to one namespace from those belonging to another. It fosters best practises thus, boosting the supportability of the code by only allowing access to supported APIs and removing access from non-published framework internals.

12) What role do the implements play in the Lightning component?

Ans: Implements are used to refer to platform interfaces that allow the components to be used in different contexts or offer access to additional context data. With the help of implements, a component can use numerous interfaces.

13) What is the difference between an action and value providers?

Ans: The action provider helps you to manage the component's actions, events, and handlers.

The value provider allows the component Javascript and markup controller to use the component attribute's value.

14) What are Lightning Web Components(LWC)?

Ans: Lightning Web Components can assist in the creation of Lightning components. They are traditional HTML elements created using advanced Javascript and HTML elements. The details can be made using any model and then placed on the Lightning page.

Salesforce Extensions for Visual Studio code are required for LWC development, and Salesforce CLI is utilized for deployment from the appropriate organization.

15) What is the use of the meta configuration file in the LWC?

Ans: The metadata values for the components are specified in the meta configuration file. If there is no configuration file for the element, it will result in an error when modifications are pushed.

Conclusion:

The subjects covered in this Salesforce lightning interview questions blog are the most in-demand talents recruiters seek in certified salesforce lightning professionals. This set of salesforce lightning interview questions will help you crack your employment interview.