Concise way to get both min and max value of Java 8 stream

Question

Is there a concise way to extract both the min and max value of a stream (based on some comparator) in one pass?

There appear to be many ways to get the min and max

Answer 1

Map each element of the stream to a pair, where the two elements represent the min and the max; and then reduce the pairs by taking the min of the mins, and the max of the maxes.

For example, using some Pair class and some Comparator:

Comparator comparator = ...;
Optional> minMax = list.stream()
    .map(i -> Pair.of(i /* "min" */, i /* "max" */))
    .reduce((a, b) -> Pair.of(
        // The min of the min elements.
        comparator.compare(a.first, b.first) < 0 ? a.first : b.first,
        // The max of the max elements.
        comparator.compare(a.second, b.second) > 0 ? a.second : b.second));