Finish runs fns parallelly, cancelled on any error.

FinishVoid runs fns parallelly.

Map maps all elements generated from given generate func, and returns an output channel.

MapReduce maps all elements generated from given generate func, and reduces the output elemenets with given reducer.

MapReduceVoid maps all elements generated from given generate, and reduce the output elements with given reducer.

MapReduceWithSource maps all elements from source, and reduce the output elements with given reducer.

MapVoid maps all elements from given generate but no output.

WithWorkers customizes a mapreduce processing with given workers.

ErrCancelWithNil is an error that mapreduce was cancelled with nil.

ErrReduceNoOutput is an error that reduce did not output a value.