Frequently Asked LWC Interview Questions & Answers

[@Himanshukumar-pw4ys]

key difference b/w track and api is : 1. track is used to observe the changes in properties object or array whereas api is used to make the property or method in a js file to be public so that the parent component can pass the data to the child component. Can we perform DML inside the wire or not? No, we cannot perform DML inside the wire as it is used only to retrieve the data from the salesforce database.

[@haribabuk5162]

@track decorator is used in some properties only in lwc like array and object,if we want to change any properties in the array or object to make that properties reactive we can use @track decorator for an array or object. @Api decorator -@Api decorator is used to make property public , generally we used api properties in child component to receive the data from the parent component. we cannot perform DML operation inside wire, if we want to perform DML in imperative method for that we need to remove @AuraEnableCacheable = true for an apex method

[@TechJourneyWithAnkit]

Correct

[@saisagar921]

Track is used with properties to track changes in Arrays or Objects Wire is Used with properties or functions to read data from apex No,we cant perform DML Inside wire Method Thank you so much sir for your videos and clear explanation

[@TechJourneyWithAnkit]

Glad you found this helpful

[@ashwinkubde5232]

==> No, we cannot perform DML operations in wire since wire services are read-only services but we have workaround to perform DML we have to remove catchable=true and use it imperative ==> @track is internal to the component. @api expose a component's property or method to the parent component, so that parent can access it.

[@TechJourneyWithAnkit]

Correct

[@PoojaSinghal-cl6wj]

1. Track decorator - used with properties to track changes in arrays or objects Wire decorator - used with properties or functions to read data from apex 2. we can’t perform DML inside wire

[@TechJourneyWithAnkit]

Correct

[@kumarvenkat739]

Thank you so much Sir, I cannot finish a video without saying a Big THANK YOU to you

[@TechJourneyWithAnkit]

Glad you liked it

[@sunilbihani7581]

Thank you so much @Ankit Sir. Its great.

[@TechJourneyWithAnkit]

Glad you liked it

[@kundlikyewale1464]

1. Track decorator - Used with properties to track changes in arrays or objects if any change occurs in track properties it will render the component Wire decorator - Used with properties or functions to read data from the apex where @AuraEnabled required 2. We can’t perform DML inside wire because which internally perform read operation to access the data

[@TechJourneyWithAnkit]

Correct

[@sonalijadhav9446]

Get the contacts related to account and show it in a data table and display one New button to create new contact record and associate that to the Account and after creating it should display in data table without page refresh LWC interview scenario

[@naj7213]

can we call wire method using LWC life cycle hooks? if yes, in which LWC life cycle hook?

[@TechJourneyWithAnkit]

Wire method is a seperate process. If you have to invoke it in life cycle change the parameter of wire in connected callback

[@haribabuk5162]

Thanks for giving these type of knowledge

[@TechJourneyWithAnkit]

Glad you liked it

[@shrutiggundewar]

Questions which were asked during interview- 1. There is multicurrency field created, how can we display the value of this field in lwc with currency 2. Create a login page on experience site with two fields - username and password. Upon click of submit button authenticate the credentials and accordingly show next page or error message.

[@TechJourneyWithAnkit]

Will consider this in upcoming videos

[@m.balaji1325]

Thankyou sir very informative

[@TechJourneyWithAnkit]

Most welcome

[@raghavendrasharma2466]

One of my interview, interviewer ask me if we make call-out from lwc, and response come bit late then how can we resolve this issue that response come fast.

[@luciferbhoi]

What would be the answer

[@TechJourneyWithAnkit]

I am not sure. There is something wrong in the question

[@NaveenKumar-sd6mx]

To make the response from the Lwc system faster, you can: 1. Make sure the most critical calls are handled first. 2. Simplify the steps needed to handle calls to reduce delays. 3. Ensure requests are sent through the quickest and most efficient paths.

[@anilkumarsahu8546]

excellent!!!

[@TechJourneyWithAnkit]

Thank you! Cheers!

[@TheBeastBananas]

Thanks. Waiting for more

[@TechJourneyWithAnkit]

Coming soon

[@ashishgupta5209]

If the interviewer asked us to write trigger or Apex code where we should write like in developer console or in notepad

[@TechJourneyWithAnkit]

If you are good with syntax, go for Developer console or vs code else notepad will be fine for interviewer. Interviewer will be more interested in approach

[@luciferbhoi]

thank you so much, I was looking for this. Subscribed to the channel and looking forward to upcoming content. Also, when can we expect the next part

[@TechJourneyWithAnkit]

As soon as possible

[@kasivisweswar577]

API- Annotate it with @api This is used to make the property public. To pass data from parent component to child component we need to use @api in child component to make it public. So that data can pass from parent to child. Track- annotate it with @track Use to make the property private and it also tracks the changes in object and array. Wire- @wire Reactive wire service is used to read the salesforce data from Apex class. We cannot perform DML operation in wire.

[@TechJourneyWithAnkit]

Inherited sharing class of directly calls runs in Sharing mode, however other by default runs in system mode

[@naveenadapa1325]

Please Upload LWC Interview Questions

[@nv1242]

Like and subscribe done.

[@TechJourneyWithAnkit]

Thanks