SCurry 1.1.0

Currying C# functions and actions

If you are here, you probably know what Curry and Partial Application are. This library contains extensions for all standard Func<> and Action<> delegates.

Features

1. Supports all standard Func<> and Action<> delegates.
2. Currying and uncurrying.
3. Partial Application with special spacer.
4. Pipe and Compose helper functions.
5. All code is auto generated and covered by unit tests.
6. Based on .NET Standard 2.0
7. No external dependencies.

Examples

Lets say you have the next function:

Func<int, int, int, int> Multiply = (a, b, c) => a * b * c;

Partial Application

The library contains Partial Application extensions for all standard delegates:

Func<int, int, int> multiply2Partial = Multiply.Partial(2, 3);
int result = multiply2Partial(4); // 24

In case if you know the values for some arguments in advance you can use the spacer:

using static SCurry.Spacer;
...
Func<int, int, int> multiply2Partial = Multiply.Partial(_, _, 2); // or Multiply.Partial(1, _, 2) or Multiply.Partial(_, 2)
int result = multiply2Partial(3, 4); // 24

At the moment you can use the spacer for delegates with up to 7 parameters. Making it more makes the library ridiculous big.

Curry

To curry use Curry extension:

Func<int, Func<int, Func<int, int>>> multiplyCurried = Multiply.Curry();
int result = multiplyCurried(2)(3)(4); // 24

You can combine it with gapped version of Partial extension to get more flexibility:

using static SCurry.Spacer;
...
Func<int, int> multiply2 = Multiply.Partial(_, _, 2).Curry();
int result = multiply6(5)(6); // 30

Uncurry

After curry you may want to get normal function back:

Func<int, int> multiply2curryed = Multiply.Partial(_, _, 2).Curry();
Func<int, int, int> multiply2 = multiply2curryed.Uncurry();
int result = multiply2(3, 4); // 24

Pipe and Compose

You can chain functions with Pipe helper:

using static SCurry.Piper;
...
Func<int, int, int, int> Multiply = (a, b, c) => a * b * c;
Func<int, int> CurryedAdd2WithGap = TestFunctions.Add2.Partial(_, 2).Curry();
Func<int, Func<int, int>> CurryedPartialMultiplyBy3 = Multiply.Partial(_, _, 3).Curry();
Func<int, Func<int, Func<int, int>>> CurryedAdd3 = TestFunctions.Add3.Curry();

var piped = Pipe(
    CurryedAdd2WithGap,
    CurryedPartialMultiplyBy3(1),
    CurryedAdd3(3)(1)
);

var result = piped(0); // 10

Or Compose them to evaluate functions in reverse order:

using static SCurry.Composer;
...
var piped = Compose(
    CurryedAdd2WithGap,
    CurryedPartialMultiplyBy3(1),
    CurryedAdd3(3)(1)
);

var result = piped(0); // 14

Installation

PM> Install-Package SCurry

dotnet add package SCurry