In this article I try to explain why Haskell keeps being such an important language by presenting some of its most important and distinguishing features and detailing them with working code examples. The presentation aims to be self-contained and does not require any previous knowledge of the language.

Solutions to exercises from the book Haskell Programming

Additional instances for the InsertLeft class from subG package. Use additional dependencies comparing to the package subG.

Some extension to the Foldable and Monoid classes. Introduces a new class InsertLeft -- the class of types of values that can be inserted from the left to the Foldable structure that is a data that is also the Monoid instance. Also contains some functions to find out both minimum and maximum elements of the finite Foldable structures.

Homework to practice Foldable, Traversable, State/Parser, Monad Transformers and Combinators, Arrow, and Lens

Traverse over structure with Alternative