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
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
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.
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
@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
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.
==> 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.
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.
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
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.
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.
