gostream

gostream package provides a Stream API similar to Java, using the Go2 Generic. This package is an experimental implementation for me to learn the Go2 Generic.

CAUTION: this package is under construction

Stream interface

Stream interface is a generic interface. As a factory of Stream interface, following functions are available:

• Of function creates a Stream from a slice.
• Builder can be used to create a Stream by adding elements.
• FileLines function returns a Stream of lines of a file.
• Range function returns a Stream by an incremental step of 1.
• RangeClosed function returns a Stream by an incremental step of 1.

Stream provides following methods:

• Filter
• Sorted
• Peek
• Limit
• Skip
• ForEach
• ToSlice
• Reduce
• ReduceToOptional
• Min
• Max
• Count
• AnyMatch
• AllMatch
• NoneMatch
• FindFirst
• FindAny
• Parallel

With the Go2 Generic, an interface cannot provided so-called generic method (in Java terms): instead, this package provides top-level functions of which the first parameter is a Stream:

• Map
• FlatMap
• Distinct
• Sorted
• Reduce
• Collect
• CollectByCollector
• Empty
• Iterate
• IteratN
• Generate
• Concat
• Sum
• Min
• Max

For CollectByCollector function, following functions as a Collector are provided:

• ToSliceCollector
• ToSetCollector
• JoiningCollector
• MappingCollector
• FlatMappingCollector
• FilteringCollector
• GroupingByCollector
• GroupingByToSliceCollector
• PartitioningByToSliceCollector
• PartitioningByCollector
• ToMapCollector
• SummarizingCollector
• SummingCollector
• CountingCollector
• ReducingCollector
• ReducingToOptionalCollector
• MaxByCollector
• MinByCollector
• AveragingInt64Collector
• AveragingFloat64Collector