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src/App.js

@@ -26,9 +26,8 @@ class BooksApp extends React.Component {
     const id = e.target.name
     const shelf = e.target.value
 //    console.log(id, shelf)
-    const changeShelf = this.state.books.filter((id, book) => book.id === id)
-    console.log("changeShelf", changeShelf)
-
+    const changeShelf = this.state.books.filter((book, id) => book.id === id)
+    console.log("changeShelf: ", changeShelf)
   }
 
   render() {