Java streams are great. Having to go from collections to streams (`.stream()`) and back (`.collect(...)`) is annoying, but understandable from a compositional p

Java streams are great. Having to go from collections to streams (`.stream()`) and back (`.collect(...)`) is annoying, but understandable from a compositional point of view. For fun, you can further reduce the size of the code above (and IMO, make it clearer), but using `Arrays.stream(product)` and a method reference for the `map`: List<ProductDisplayInfo> list = Arrays .stream(products) .filter(p -> p.getCategory() == 2 || p.getCategory() == 5 && isProductUnderDiscount(p)) .map(ProductDisplayInfo::new) .collect(Collectors.toList());