Salesforce Interview Question – Part 2

global class ScheduleUpdate implements Schedulable{
    global void execute(SchedulableContext SC){}
}

global class ScheduleUpdate implements Schedulable
{
    global void execute(SchedulableContext sc) {
        // Implement any logic to be scheduled
        // We now call the batch class to be scheduled BatchContactUpdate b = new BatchContactUpdate ();
        //Parameters of ExecuteBatch(context,BatchSize) database.executebatch(b,200);
    }
}

17. What do you understand about workflow in Salesforce?

Workflow allows automation of standard internal processes for saving time across an organization. It helps in evaluating records as they are created or updated. It also determines whether an automated action must occur, such as functions like follow-up emails, marketing activities, tracking the customer map journey, and more.

A workflow rule is a container for various workflow instructions, usually summed up in an if/then statement.

18. What is Apex in Salesforce?

Apex is a strongly typed OOP language that allows developers to execute transaction control statements and flow on Salesforce platform servers in conjunction with calls to the API. Its syntax is similar to Java and serves as database stored procedures. The code can be initiated via triggers on objects and requests from web services, and they run on the Lightning platform.

Apex enables developers to incorporate business logic to system events, including button clicks, Visualforce pages, and related record updates.

19. What is the difference between public and global?

The public access modifier declares that this class is visible in your application or namespace. The global access modifier declares that this class is known by all Apex code everywhere

20. What is the difference between Aura and LWC?

There is a particular difference between Aura and LWC. The LWC-based lightning component is built using web stack tools, whereas the aura-based lightning components are built using HTML5 and JavaScript tools.

21. What are lifecycle hooks in LWC ?

Ans: A lifecycle hook is a callback method triggered at a specific phase of a component instance’s lifecycle.

There are following hooks supported in LWC :

Constructor : Called when the component is created.

Connectedcallback : Called when the element is inserted into a document. This hook flows from parent to child.

RenderedCallback : Called after every render of the component. This lifecycle hook is specific to Lightning Web Components, it isn’t from the HTML custom elements specification. This hook flows from child to parent. Ie its not part of HTMLElement rather defined in LightningElement.

Disconnectedcallback : Called when the element is removed from a document. This hook flows from parent to child.

Errorcallback  : Called when a descendant component throws an error. The error argument is a JavaScript native error object, and the stack argument is a string. This lifecycle hook is specific to Lightning Web Components, it isn’t from the HTML custom elements specification

22. How can call the Batchable class using future Methods?

Ans. Database.execute(BatchableClass, 200);

23. What is the Order of Execution in LWC?

• constructor
• wire
• connectedCallback
• render
• renderedCallback
• wire
• render
• renderedCallback

24. What is the difference Between Esclation Rule and Assignment Rule?

Ans. Assignment Rules applies for leads or cases. Escalation Rules applies for cases.

25. What is the Asynchronous Apex?

Ans. Asynchronous Apex is used to run processes in a separate thread, at a later time. An asynchronous process is a process or function that executes a task “in the background” without the user having to wait for the task to finish.

26. What is the Validation Rule?

A validation rule is one way to restrict input in a table field or a control (such as a text box) on a form. Validation text lets you provide a message to help users who input data that is not valid.

Check out another amazing blog by Aman here: What is Enhanced Domain Security in Salesforce in 2023?

27. How to get the Current Login User?

Ans. To get the current login user using this userinfo.getuserinfo();

28. How many types of events in trigger?

Ans.

29. What is the Difference Between trigger.old & trigger.new?

Ans. Trigger.New variable returns the list of sObject which has invoked the trigger and Trigger.old returns a list of the older versions of the records which have invoked the trigger. Trigger.Old is only available in update and delete events.

30. What is the Difference Between trigger.new & trigger.newMap?

Ans. Trigger.New variable returns the list of sObject which has invoked the trigger and Trigger.NewMap returns the map of ID’s with the newly entered records. NewMap is only available in after insert, before and after the update and after undelete