Saleforce Interview Questions 8

Lightning:

Q) What are lightning components?
Ans. The Lightning Component framework is a UI framework for developing web apps for mobile and desktop devices. It’s a modern framework for building single-page applications with dynamic, responsive user interfaces for Lightning Platform apps.

Q) What are Aura components?
Ans. Aura components are the self-contained and reusable units of an app. They represent a reusable section of the UI, and can range in granularity from a single line of text to an entire app.  These components are also known as the base Lightning components. You can assemble and configure components to form new components in an app. Components are rendered to produce HTML DOM elements within the browser.

Q) What are Web components?
Ans. Lightning Web Components uses core Web Components standards and provides only what’s necessary to perform well in browsers supported by Salesforce. Because it’s built on code that runs natively in browsers, Lightning Web Components is lightweight and delivers exceptional performance.

Q) Difference between Aura and Web components.

Ans.
 LWC uses core web components.
 LWC is fast and has better performance that Aura Components.
 LWC needs Salesforce DX understanding to build up web apps.
 LWC can not be configured in Devconsole, rather have Playground or configure External tools like visual studio code to program.

 Q) What are Events ?
Ans. Events are mode of communication among Aura lightning components among App or nested components.

Q) How many types of event are there?
Ans. 
Component event (communicates within the parent components) and Application event(communication of components withing application).

Q) Does lightning components follow oops concept ?
Ans. The framework provides the basic constructs of inheritance and encapsulation from object-oriented programming and applies them to presentation layer development. But, always favors composition (nested aura components). Inheritance works well when extends from base components.

Comments

Post a Comment

Popular posts from this blog

Salesforce Q&A Part 1:

Configurations Q) What is a record type and why we use record type? Ans . Record type can be considered as segments/slice of an object, all record types will have same fields that of the object but the data that is put into different record type depends on the business process. Record types allow you to offer different business processes, picklist values, and page layouts to different users.      Note:  Each record type has their own values available for a picklist on the object.  Create a different page layout for different records within the same object. Q). Example where it’s used. Ans . A practical place where the above is used is via workflow field updates or approval process field updates. As a step in a workflow you can flip the record type of a record therefore making available different fields on a page layout and different picklist values in the same field that weren’t available before the workflow happened. Q).   What ...
Read more

Salesforce Q&A Part 2:

Configuration Continued: Q) What are the different ways of sharing a record with an user in Salesforce? Ans.   OWD, Profile, Role, Permission settings. Q)   What is sharing rule in Salesforce? Ans.   S haring rules are used to extend sharing access to users in public groups, roles, or territories . The access can be both Read only/Read Write access. Q) Can we override OWD? Ans. Yes, it is overridden whenever you declare a permission set or create a sharing rule. Sharing rules create automatic exceptions to OWD to provide greater access to user(s). Q)   What is a validation rule and why we use it? Ans. Validation rule validate data entered by user or a program to salesforce record. it is used to improve and maintain data quality. Q) What is the return type of validation rule? Ans. Formula or Expression returns Boolean. Q) When does a validation rule display an error message? Ans.  Expression/Formula returns True. Q) Methods/Proce...
Read more

Salesforce Q&A Part 7:

Apex Test  Q)Why use test class in salesforce? Ans.  Test class is important to check the sanity and sole purpose of custom apex code written for organization. Apex code having minimum 75% of test class coverage is considered healthy apex code.  Q)How will the salesforce compiler knows you are writing a test class? Ans.  Using @isTest annotation and static testmethod() are two things. Q)How to make the private variable and methods visible? Ans.  Using @testVisible annotation. Q)What are the lines present in main code that are ignored in test class. Ans.  System.debug statements. Q)How can we run the test class for particular user? Ans.  using system.runAs(userProfile/username) Q) How to test asynchronous apex? Ans.  Using Test.start?() and Test.stop(). Q) How do you write test class for web-service class? Ans. Define a mock test  class implementing WebserviceMock interface for SOAP. and  StaticResourceCalloutM...
Read more