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Eric Torreborre
The Eff monad
One monad to
rule them all!
It must be evident how multifarious
and how mutually complicated are
the considerations which the working
of such an engine involve. There are
frequently several distinct sets of
effects going on simultaneously; all
in a manner independent of each
other, and yet to a greater or less
degree exercising a mutual influence.
Ada Lovelace,
1842
You could have
invented monads!
Exceptions?
Exceptions?
State?
State?
Genius!
Can we have both state and error?
First idea: stack them!
1996!
Which order?
DOES NOT WORK!
THIS ONE WORKS!
DIFFERENCE?
DIFFERENCE?
DIFFERENCE?
ORDER IS
IMPORTANT!
GENERALISE
STACKING HAS A COST!
SIMILAR EFFECTS?
IN PRACTICE
Specialized stacks
Specialized functions
WHAT IF?
We need to use both Hadoop and S3?
WHAT ELSE?
WHAT ELSE?
Type-
level
effects
Eff monad
Value-
level
effects
Continuatio
nsInterpreters
Member
typeclass
Effect
Type-level
effects
Value-level
effects
Value-level
effect
Continuations
Option
Interpreter
State
Interpreter
Continuation1
Continuation2
Option
Interpreter
Continuation3 +
State
Interpreter
OPTION RELOADED
KLEISLI
OPTION AS EFFECT
EFF
ERROR AS EFFECT
NEVER RE-IMPLEMENT
flatMap
EVER AGAIN!
EFFECTS UNITE!
Type-level
effects
Value-level
effects
Value-level
effects
Member
typeclass
LIBRARY
scalaz.Future
STACKOVERFLOW
:-(
STACK SAFE
TRANSFORM
EFFECTS
SO, SILVER
BULLET?
SORRY
NO
Implicits
Implicits
Use it in prod'
Renamings
Check laws
Missing functions
Benchmarking, Scalajs...
CREDITS
LINKS
Monads for functional programming
Monad transformers and modular interpreters
Extensible effects
Reflection without remorse
Freer monad, more extensible effects
THANKS!
Matchers
Matchers
Matchers
Matchers
MORE
TROUBLE
List(5, 7, 1)
TOO BIG?
ONE MORE ERROR LAYER!

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The Eff monad, one monad to rule them all

Notas del editor

  1. M denotes the effect that goes with A