Using fold to parallelize collections

A collection that implements the CollReduce protocol is still sequential by nature. Using the reduce function with CollReduce does have a certain amount of performance gain, but it still processes elements in a collection in a sequential order. The most obvious way to improve the performance of a computation that is performed over a collection is parallelization. Such computations can be parallelized if we ignore the ordering of elements in a given collection to produce the result of the computation. In the reducers library, this is implemented based on the fork/join model of parallelization from the java.util.concurrent namespace. The fork/join model essentially partitions a collection over which a computation has to be performed into two halves and processes each partition in parallel. This halving of the collection is done in a recursive manner. The granularity of the partitions affects the overall performance of a computation modeled using fork...