Filtering and live reports
Derive a report from the ledger
A report should be derived from source data every time—not maintained as a second, conflicting copy. The selected category determines a filtered view; reduce produces the KPIs; sort makes the audit table predictable.
The practice dataset is visibly labeled. Replace it with your own entries after the exercise.
手順
Create getVisibleTransactions using filter and selectedCategory.
ヒント： Keep every item when selectedCategory is all.
どこに書けばいい？
// Build getVisibleTransactions(), calculateReport(), and renderReport().9 行目に書きましょう — そのコメントの下、すでに書いたコードの後ろです。
Sort visible rows by date without changing the source array.
Create calculateReport(items) with reduce.
Listen for filter changes and render the report again.
あなたのコード
このステップで作りたいものを伝えてください。コードを書きます。あとは「適用」をクリックすればエディタに反映されます。 このステップ：Create getVisibleTransactions using filter and selectedCategory.