Java convert method to lambda expression

Question

what this method should look like in lambda expression ?

public Book returnBook(int idBook){
   for (Book b : records){
        if(b.getIdBook() == idBook){
            return b;
        }
    }

    return null;
}

Ousmane D. · Accepted Answer · 2020-05-07 18:25:48Z

2

The stream version would primarily be made of filter + findFirst

return records.stream()
              .filter(book -> book.getIdBook() == idBook)
              .findFirst()
              .orElse(null);

answered May 7, 2020 at 18:25

Ousmane D.

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1 Comment

Naman Over a year ago

or Optional<Book> returnBook(int idBook) works nicely as well :)

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