Java Stream: find an element with a min/max value of an attribute

Question

I have a stream of objects and I would like to find the one with a maximal value of some attribute that\'s expensive to calculate.

As a specific simple example, say

Answer 1

Stream stringStream = stringList.stream();
String coolest = stringStream.reduce((a,b)-> 
    coolnessIndex(a) > coolnessIndex(b) ? a:b;
).get()