FunCs

Functional extensions and support for C#.

What it's for

Very lightweight syntax functional support for C#, for things which either don't exist, or a pain to use.

Currently included:

• Use var to declare lambdas;
• Functional composition;
• Partial function application (currying).

Use 'var' to declare lambdas:

What is a less of a pain and makes more sense to you? And what is easier to convert to a method should you want to?

// Standard C#
Func<int, string> f = (x) => x.ToString();

// With FunCs
var f = Fun.function((int x) => x.ToString());

Restrictions:

• Can only use inside a method: can't use var to declare instance members :(
• Up to 9 input parameters;
• It's a Func, so must have a return value, can't do `void.

Function composition: create functions by chaining them together.

var stringToInt = Fun.function((string s) => int.Parse(s));
var intToHexString = Fun.function((int n) => n.ToString("X"));

// compose
var stringToHexString = Fun.compose(stringToInt, intToHexString);

// or, using extension
var stringToHexString = stringToInt.compose(intToHextString);

// use it
var s = stringToHexString("255");  // = "FF"

Restrictions:

• Can only use with Func<> types.
• Cannot use with methods :( For a somewhat unconvincing answer why, see Eric Lippert's post on SO.

Partial function application (currying)

var plus = Fun.function((int x1, int x2) => x1 + x2);
var plus10 = plus.curry(10);    // or Fun.curry(plus, 10)
var r1 = plus(2);               // = 10 + 2 = 12
var r2 = plus(5);               // = 10 + 5 = 15

Restrictions:

• Same as with compose.

Getting the stuff

This is a sort of a "beta" at the moment. More stuff will be added.

.NET Version Support

Currently only 4.0 and 4.5.

If there is a demand for earlier versions (3.5, 3.0 and 2.0), add an issue to this project.

Nuget

There is a nuget package for it here.

Binaries

There are pre-built binaries in published directory. Feel free to grab those.

Source code

Feel free to use as a source code. It should be trivial to do so.

License

MIT license. Feel free to use either as binary releases or as source code.