optional chaining javascipt code example
Example 1: optional chaining
/*
* optional chaining (?.) allows me to write code that stops
* running when we encounter a null or undefined value
*/
function tryGetFirstElement<T>(arr?: T[]) {
return arr?.[0];
// equivalent to
// return (arr === null || arr === undefined) ?
// undefined :
// arr[0];
}
Example 2: optional-chaining operator
if (user?.team?.subscription?.invoices) {
//
}