typescript return value if not chained code example

Example 1: conditional chaining chrome

const nameLength = db?.user?.name?.length; // property
const adminOption = db?.user?.validateAdminAndGetPrefs?.().option; // functions
const optionLength = db?.user?.preferences?.[optionName].length; // dynamic property
const userName = usersArray?.[userIndex].name; // on arrays

Example 2: optional chaining

const array = [1,2,3,4,5];
let arrItem = array?.[4]; 

console.log(arrItem); /// 5