stepchowfun / Effects
Licence: bsd-3-clause
A brief exploration of the various approaches to modeling side effects in a purely functional programming language.
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haskell
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Effects
A brief exploration of the various approaches to modeling side effects in a purely functional programming language.
The challenge
Write a program that initializes an accumulator and random seed both with 0 and then runs the following procedure 10 times:
- Log the value of the accumulator.
- Pick an integer uniformly randomly from the half-open interval
[0, 10). - Mutate the accumulator by adding the random integer to it.
Thus, 3 computational effects are exhibited: logging, randomness, and mutable state.
Techniques demonstrated
This repository contains 4 implementations of the program described above, each demonstrating a specific technique:
- A bespoke monad
- A standard monad transformer stack
- A free monad
- The
Effmonad from the "extensible effects" framework
Instructions
Make sure you have Toast installed. Then you can run toast run to build and run the demo.
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