Find best

library operator
ID: d5890068-9bb3-47e9-958c-247402d8f82d
Finds the best item using a chooser delegate to decide which item is better.


The implementation of Find best makes use of the following 2 operators.

Takes two items and emits one of them, using a chooser delegate as decider.
Reduces the items of a stream pairwise using a reducer delegate.