How To Add List/Set of Records to List in Go Language

In Go language if we want to add single record/list of records we can use the append() method. But here is the trick adding the single item is pretty much forward and while adding the list/set of records we might face some issue.

Now we will discuss how to handle both the scenarios

Adding a single item/record to list/array:

package main

func main() {
	
	var finalItemList []string
	var singleItem string
	finalItemList = append(finalItemList, singleItem)

}

Adding multiple items/list to another list/array:

To add list of items to another list with help of append() we will receive an error as can not use variable of type of list/array as a data type value in argument to append.

To solve this simply we can just use ... (3 dots) notation as shown below.

package main

func main() {
	
	var finalItemList []string
	var secondItemList []string
	finalItemList = append(finalItemList, secondItemList...)

}

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How To Add a New Record To Existing List Of Records in LWC JS Controller

Let's assume we are getting  list of records from the apex to js controller and for some reasons if we want to add new row how can we add to it we can see below.

import { LightningElement, api, track, wire } from "lwc";
import fetchActivities from "@salesforce/apex/CancelFlowCntrl.fetchCanActivities";

const columns = [
    { label: 'ticketvalue', fieldName: 'totalTicketvalue' },
    { label: 'refundedAmount', fieldName: 'totalRefundedAmount' },
    { label: 'cancellationCharges', fieldName: 'totCancellationCharges' },
    
];

export default class ActivitiesFlow extends LightningElement 
{
  
  @track allActivitiesData;
  
  @wire(fetchActivities, { recdId: '$sfrecordId' })
    wiredActivities({ error, data }) {
       if (data) 
       {
          this.allActivitiesData =  data;
		  var newItem = {"totalTicketvalue": 100,"totalRefundedAmount": 90,"totCancellationCharges":10};
		  this.allActivitiesData.push(newItem);

		}
		
		else if (error) {
            this.error = error;
            this.allActivitiesData = undefined;
           
        }
	}
 }

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