TP

How many tuple types are there in C#?

In a recent StackOverflow question the poster asked about the difference between tupled and curried form of a function in F#. In F#, you can use pattern matching to easily define a function that takes a tuple as an argument. For example, the poster's function was a simple calculation that multiplies the number of units sold n by the price p:

1: 
let salesTuple (price, count) = price * (float count)

The function takes a single argument of type Tuple<float, int> (or, using the nicer F# notation float * int) and immediately decomposes it into two variables, price and count. The other alternative is to write a function in the curried form:

1: 
let salesCurried price count = price * (float count)

Here, we get a function of type float -> int -> float. Usually, you can read this just as a function that takes float and int and returns float. However, you can also use partial function application and call the function with just a single argument - if the price of an apple is $1.20, we can write salesCurried 1.20 to get a new function that takes just int and gives us the price of specified number of apples. The poster's question was:

So when I want to implement a function that would have taken n > 1 arguments, should I for example always use a curried function in F# (...)? Or should I take the simple route and use regular function with an n-tuple and curry later on if necessary?

You can see my answer on StackOverflow. The point of this short introduction was that the question inspired me to think about how the world looks from the C# perspective...

val salesTuple : price:float * count:int -> float

Full name: Tuples-in-csharp.salesTuple
val price : float
val count : int
Multiple items
val float : value:'T -> float (requires member op_Explicit)

Full name: Microsoft.FSharp.Core.Operators.float

--------------------
type float = System.Double

Full name: Microsoft.FSharp.Core.float

--------------------
type float<'Measure> = float

Full name: Microsoft.FSharp.Core.float<_>
val salesCurried : price:float -> count:int -> float

Full name: Tuples-in-csharp.salesCurried

Published: Tuesday, 17 September 2013, 2:11 PM
Tags: c#, f#, functional programming
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