JSFiddle - React, Tailwind, and code Playground

JavaScript

$.calc=function(arrayName){
    console.log(arrayName);
    for(i=0;i<arrayName.length;i++){
        if(i==2){
            arrayName[i]="";
        }
    }
}

var arr=new Array();
arr[0]="saab";
arr[1]="saab";
arr[2]="saab";
arr[3]="saab";
arr[4]="volvo";
arr[5]="volvo";

//First run
$.calc(arr);

//Second run
$.calc(arr);