Inclusive takeWhile() for Streams

Question

I want to know if there is a way to add the last element of the stream that was tested against the condition of the method takeWhile(). I believe I want to achieve something

Answer 1

There's no convenient way to do that with the normal stream API. It is possible in an ugly way (you would need to adapt this implementation, that's just a normal takeWhile "backported" for Java 8).

This guy has written a stream extension library which has takeWhileInclusive.

Sample usage:

IntStreamEx.of(1, 3, 2, 5, 4, 6)
    .peek(foo -> System.out.println("Peek: " + foo))
    .takeWhileInclusive(n -> n < 5)
    .forEach(bar -> System.out.println("forEach: " + bar));