DFun

DFun is Delphi library to support functional programming style. It is work in progress.

Currently it contains these types:

• List
• Maybe
• Either
• Pair
• Null

List

Singly-linked immutable list.

Construction

Xs := List.Cons<Integer>(1, List<Integer>.Empty);
Ys := List.FromArray<Integer>([1, 2, 3]);

Maybe

Optional value. It contains either Nothing or Just the value.

Either

A coproduct type, typically represents a result of and operation. It contains either the left side (usually an error value) or the right side (the actual value).

Pair

A product type, an ordered pair.

Null

An unit type, represents a type with single value. "Unit" cannot be used as a name, because it's a Delphi keyword.