Wearing the hair shirt Wearing the hair shirt - Microsoft Research

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Type classes summary A much more far-reaching idea than we first realised Variants adopted in Isabel, Clean, Mercury, Hal, Escher Open questions: – tension between desire for overlap and <strong>the</strong> open-world goal – danger of death by complexity
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Wearing the hair shirt A retrospect
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Haskell is 15 years old (born FPCA
Page 5 and 6: Timeline Sept 87: kick off Apr 90:
Page 7 and 8: Reflections on the process The i
Page 9: Reflections on process Self-appoin
Page 12 and 13: Syntactic redundancy Seductive ide
Page 14 and 15: “Expression style” Define a fun
Page 16 and 17: Example (ICFP02 prog comp) Pattern
Page 18 and 19: What really matters?
Page 20 and 21: But... Laziness makes it much, muc
Page 22: Combinator libraries Recursive valu
Page 25 and 26: Monadic I/O A value of type (IO t)
Page 27 and 28: Connecting I/O operations (>>=) ::
Page 29 and 30: Control structures Values of type (
Page 31 and 32: Monads Exceptions type Exn a = E
Page 33 and 34: The IO monad The IO monad allows
Page 35 and 36: What have we achieved? ...without
Page 37 and 38: Open challenge 1 Open problem: the
Page 39 and 40: Monad summary Monads are a beautif
Page 41 and 42: What really matters? Laziness Purit
Page 44 and 45: Type classes class Eq a where (==)
Page 46 and 47: Type classes over time Type classe
Page 48 and 49: Quickcheck propRev :: [Int] -> Bool
Page 50 and 51: Extensiblity Like OOP, one can add
Page 52 and 53: Type-based dispatch class Num a whe
Page 54 and 55: Cool generalisations Multi-paramet
Page 58 and 59: Sexy types Haskell has become a lab
Page 60 and 61: How sexy? Damas-Milner is on a cus
Page 62 and 63: Modules ML functors Difficulty Hask
Page 64 and 65: Modules Haskell has many features
Page 66 and 67: Encapsulating it all runST :: (fora
Page 68: The Haskell committee Arvind Lennar
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Wearing the hair shirt Wearing the hair shirt - Microsoft Research

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