For upgrading to streamly-0.9.0+ please read the <https://github.com/composewell/streamly/blob/streamly-0.10.0/docs/User/Project/Upgrading-0.8-to-0.9.md Streamly-0.9.0 upgrade guide>. . Streamly is a standard library for Haskell that focuses on C-like performance, modular combinators, and streaming data flow model. Streamly consists of two packages: "streamly-core" and "streamly". <https://hackage.haskell.org/package/streamly-core streamly-core> provides basic features, and depends only on GHC boot libraries (see note below), while <https://hackage.haskell.org/package/streamly streamly> provides higher-level features like concurrency, time, lifted exceptions, and networking. For documentation, visit the <https://streamly.composewell.com Streamly website>. . The streamly-core package provides the following functionality: . * Streams as composable producers of a sequence of values. * Streams provide all the functionality provided by Haskell lists but in an effectful, streaming fashion with better performance. * Streams provide ListT and logic programming functionality as well. * Folds as composable stream consumers that reduce the streams to a single value or reduce segments of streams to transform the stream. * Parsers as more powerful, composable stream consumers supporting standard parser combinators with backtracking but in a streaming fashion. * Arrays with streaming interfaces providing high performance, modularity, and concise interface as all streaming operations can be performed on arrays. * Arrays can be immutable or mutable, unboxed or boxed, pinned or unpinned. * Arrays generalize the functionality provided by @bytestring@ and @text@ packages. * Interoperability with @bytestring@ and @text@ is provided via separate packages. * Arrays and folds provide natural builder functionality so there are no separate builder modules. * High performance binary serialization with configurable JSON like features. * Streaming combinators for unicode text processing, providing functionality equivalent to the @text@ package. * String interpolation for convenient construction of strings. * Streaming console IO (stdin/stdout) operations. * Streaming file and directory IO operations. . This package covers some or all of the functionality covered by @streaming, pipes, conduit, list-t, logic-t, foldl, attoparsec, array, primitive, vector, vector-algorithms, binary, cereal, store, bytestring, text, stringsearch, interpolate@. Streamly provides a consistent, concise, modular and performant interface for all this functionality. . Note: The dependencies "heaps" and "monad-control" are included in the package solely for backward compatibility, and will be removed in future versions.