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Track exercises

5 Exercises

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About Idris

Idris is a general purpose pure functional programming language with dependent types. Dependent types allow types to be predicated on values, meaning that some aspects of a program’s behaviour can be specified precisely in the type. It is compiled, with eager evaluation. Its features are influenced by Haskell and ML, and include:

  • Full dependent types with dependent pattern matching
  • Simple foreign function interface (to C)
  • Compiler-supported interactive editing: the compiler helps you write code using the types
  • where clauses, with rule, simple case expressions, pattern matching let and lambda bindings
  • Dependent records with projection and update
  • Interfaces (similar to type classes in Haskell)
  • Type-driven overloading resolution
  • do notation and idiom brackets
  • indentation significant syntax
  • Extensible syntax
  • Cumulative universes
  • Totality checking
  • Hugs style interactive environment
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module EvenOdd

data Even : Nat -> Type where
  EZ : Even Z
  ES : Even n -> Even (S (S n))

ee : Even n -> Even m -> Even (n + m)
ee EZ m     = m
ee (ES n) m = ES (ee n m)

Exercism is a great website

What I like about it is that I am able to solve the challenges in a TDD way working in a environment that I am familiar (my own PC not a browser IDE) and the cherry on the top of the cake is that I have access to code reviews.

Fun. Challenging. Interesting

Community-sourced Idris exercises

These are a few of the 5 exercises on the Idris track. You can see all the exercises here.

RNA Transcription
pattern matching
Hello World
optional values
text formatting
export modifiers

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