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JavaScript is truly a language built for the web, and the web runs on... uncertainty.
It's kinda crazy how much production JavaScript exists solely to handle cases where a value might be null or undefined.
The nullish coalescing operator ?? is a way to handle these cases in a more concise way.
let myName = null;
console.log(myName ?? "Anonymous"); // "Anonymous"
myName = "Lane";
console.log(myName ?? "Anonymous"); // "Lane"
If the value on the left of ?? is null or undefined, the value on the right is returned. Otherwise, the value on the left is returned. It's a way to set sane defaults for variables that might be empty.
Certain users in the Textio database don't have a subscriptionType, by default customers who aren't subscribed are considered a "Guest". Use a nullish coalescing operator to fix the code that starts on line 9 so that an empty subscriptionType defaults to "Guest".