C# lambda - curry usecases

Question

I read This article and i found it interesting.

To sum it up for those who don\'t want to read the entire post. The author implements a higher order function named Curry

Answer 1

Currying is used to transform a function with x parameters to a function with y parameters, so it can be passed to another function that needs a function with y parameters.

For example, Enumerable.Select(this IEnumerable source, Func selector) takes a function with 1 parameter. Math.Round(double, int) is a function that has 2 parameters.

You could use currying to "store" the Round function as data, and then pass that curried function to the Select like so

Func roundFunc = (n, p) => Math.Round(n, p);
Func roundToTwoPlaces = roundFunc.Curry()(2);
var roundedResults = numberList.Select(roundToTwoPlaces);

The problem here is that there's also anonymous delegates, which make currying redundant. In fact anonymous delegates are a form of currying.

Func roundToTwoPlaces = n => Math.Round(n, 2);
var roundedResults = numberList.Select(roundToTwoPlaces);

Or even just

var roundedResults = numberList.Select(n => Math.Round(n, 2));

Currying was a way of solving a particular problem given the syntax of certain functional languages. With anonymous delegates and the lambda operator the syntax in .NET is alot simpler.