Validation and error handling
Protect the ledger from bad input
Real users mistype, paste spaces, and leave fields empty. Production code treats that as expected behavior. A validation function either returns a clean transaction or throws a precise error. The submit handler catches it and shows a useful message.
Never silently turn invalid money into zero. Invalid is not empty, and empty is not zero.
Anweisungen
Create createTransaction(description, amount) and trim the description.
Tipp: const cleanDescription = description.trim();
Wo kommt das hin?
// Build createTransaction(description, amount), then use try/catch on submit.Schreib es in Zeile 5 — unter diesem Kommentar, nach dem Code, den du schon ergänzt hast.
Reject a short description and non-positive or non-finite amount.
Wrap transaction creation in try/catch.
Show the error message in #form-error.
Dein Code
Beschreibe, was du für diesen Schritt bauen willst, und ich schreibe den Code — klicke dann auf Übernehmen, um ihn in deinen Editor zu übertragen. Dieser Schritt: Create createTransaction(description, amount) and trim the description.