Each predicate is a separate scope. How is the complexity additive? If you really have to you can simply be just as specific in your predicate naming as you w

Each predicate is a separate scope. How is the complexity additive? If you really have to you can simply be just as specific in your predicate naming as you would in a for loop. var authorsOfLongBooks = books .filter(book => book.pageCount > 1000) .map(longBooks => longBooks.author) .distinct()