currying

I read this post on Dr. Dobb's about currying and partial functions in JavaScript. It looks useful, but I'm wondering (as an occasional developer in JavaScript) if there are standard situations where this is regularly used? For starters, I personally wouldn't recommend currying in 99% cases. It can easily make code unreadable if used improperly. However, some of the applications that I could name would be associated with setting the function context. For example when you first execute the currying function with a context (something other than window object etc), you could have a function that

i am reading Accelerated C# i don't really understand the following code: public static Func<TArg1, TResult> Bind2nd<TArg1, TArg2, TResult> ( this Func<TArg1, TArg2, TResult> func, TArg2 constant ) { return (x) => func( x, constant ); } in the last line what is x referring to? and there's another: public static Func<TArg2, Func<TArg1, TResult>> Bind2nd<TArg1, TArg2, TResult> ( this Func<TArg1, TArg2, TResult> func ) { return (y) => (x) => func( x, y ); } How do i evaluate this? (y) => (x) => func( x, y ) what is passed where ... it does confusing. Let's first simplify the code: Func<int, int>

I wonder what this means in F#. “a function taking an integer, which returns a function which takes an integer and returns an integer.” But I don't understand this well. Can anyone explain this so clear ? [Update]: > let f1 x y = x+y ;; val f1 : int -> int -> int What this mean ? Bruno Reis F# types Let's begin from the beginning. F# uses the colon ( : ) notation to indicate types of things. Let's say you define a value of type int : let myNumber = 5 F# Interactive will understand that myNumber is an integer, and will tell you this by: myNumber : int which is read as myNumber is of type int F#

NOTE: This question was asked while Swift 2.1 was the latest. Given: class IntWrapper { var i: Int = 1 } func add(inout m: Int, i: Int) { m += i } And a higher order function func apply() -> (inout i: Int) -> () -> () { return { (inout i: Int) -> () -> () in return { add(&i, i: 1) } } } Application as so results in the member variable value never changing: var intW = IntWrapper() print(intW.i) // Prints '1' apply()(i: &intW.i)() print(intW.i) // Prints '1' However, when changing the function to curried form func apply()(inout i: Int)() -> () { add(&i, i: 1) } Application results in the member

What is the advantage of Currying in C#? What is the advantage of achieving partial function application on a curried function? The advantage of Currying in C# is that it allows C# developers to develop in a Functional Programming style. Think about LINQ. A LINQ query allows you to pass in a method as a parameter: someCollection.Where(x => x.someVal == 1); x.someVal == 1 gets evaluated as a function and then Where uses the return value in its own execution. It's an example that most .NET 3 developers are familiar with, but few realize that they're dabbling in Function Programming. Without the

const f = (arg1) => (arg2) => { /* returns something */ } Is it possible to memoize f with regard to the 2 arguments, namely: f(1)(2); f(1)(3); // Cache not hit f(4)(2); // Cache not hit f(1)(2); // Cache hit Nina Scholz You could take a Map as cache and take nested maps for all following arguments. This cache works for arbitrary count of arguments and reuses the values from the former calls. It works by taking a curried function and an optional Map . If the map is not supplied, a new map is created which serves as base cache for all other calls of the returned closure or the final result. The