15 Stream processing and incremental I/O

This chapter covers

  • Shortcomings of imperative IO
  • Transformation using stream transducers
  • Building an extensible Process type
  • Single input and output processing with Source and Sink
  • Combining multiple input streams using Tee

We said in the introduction to part 4 that functional programming is a complete paradigm. Every imaginable program can be expressed functionally, including programs that interact with the external world. But it would be disappointing if the IO type were the only way to construct such programs. IO and ST work by simply embedding an imperative programming language into the purely functional subset of features that we have explored up to now. While programming within the IO monad, ...

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