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Janis Hutz
2026-02-27 17:11:45 +01:00
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semester4/fmfp/parts/00_haskell/00_intro.tex
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Haskell is a functional programming language. As such, its functions can be thought of as being similar to mathematical functions and as such are side-effect-free.
Haskell's type system is very robust and an interesting topic to learn about.
The basic data types you already know from other programming languages are also present here. This includes all primitives like integers, floating point numbers, chars and booleans.
Strings are handled similarly to how \texttt{C} does it, in that strings are char arrays.
Arrays however are dynamic length in Haskell as opposed to many other statically typed programming languages.
Since Haskell is an imperative language (i.e. you describe \textit{what} you want achieve)
as opposed to a declarative language (i.e. you describe \textit{how} you achieve what you want to achieve), there are no loops in Haskell,
as loops don't appear in mathematical formulas and functions either.
What we can do however is recursion and this is the main way of doing iterative work in Haskell.
Additionally, Haskell features \textit{lazy evaluation} (i.e. statements are evaluated only as needed) as opposed to \textit{eager evaluation} (i.e. statemetns are evaluated immediately).
In this course the \texttt{Glasgow Haskell Compiler}, short \texttt{ghc} is used. Installation is really easy (as long as you're on Linux)