User:Duplode/Awkward squad plan

Mutable objects

• Introduction: suggest typical use cases − low-level interfaces with external libraries, algorithms that demand mutability, huge volumes of data.
• IORefs: basic example, point out concurrency pitfalls, link to Concurrency.
• ST: Isolated mutability. A word or two on existentials. A hashtables example. (A link to, or an adaptation of, augustuss' quicksort?)
• Other references: Haskell Cafe thread on the need for global mutable state.

Concurrency

• MVar
• STM
• Validate the memoisation example currently there.
• Integrate the STM example from Haskell/Practical monads
• References: SPJ's Awkward Squad

Effectful streaming

• The pitfalls of lazy IO.
• Probably use Pipes, but also mention Conduit.

Exceptions

• ExceptT will likely be mentioned elsewhere already.
• What else to include? (Control.Exception? Gabriel's errors (see also http://www.haskellforall.com/2012/07/errors-10-simplified-error-handling.html)?)