How to check if array element exists or not in javascript?

Question

I am working with Titanium, my code looks like this:

var currentData = new Array();

if(currentData[index]!==\"\"||currentData[index]!==null||currentData[ind         


        

Answer 1

This also works fine, testing by type against undefined.

if (currentData[index] === undefined){return}

Test:

const fruits = ["Banana", "Orange", "Apple", "Mango"];

if (fruits["Raspberry"] === undefined){
  console.log("No Raspberry entry in fruits!")
}