Process function definition c#

Question

i am still learning c# and .net core. Some time ago one guy send to me a exercise on which unfortunately i fall off mainly because of this function definition :

public static (int UserId, decimal MaximumTotalInstallment)[] Process(User[] users) {}

This is a library function which is used in XUnit test class in another namespace :

var expected = new[] {(1, 100m), (2, 1000m)};
        
// when
var output = BatchProcessingLibraryClass.Process(input);
        
// then
output.Should().BeEquivalentTo(expected);

Could You please tell me what this call of lib function exactly do ? I dont meet this kind of function declaration before.

`(int UserId, decimal MaximumTotalInstallment)` is named *tuple* which contains two properties: `int UserId` and `decimal MaximumTotalInstallment`. Then when adding `[]` we have *array* of named tuples: `(int UserId, decimal MaximumTotalInstallment)[]`. I hope that `User[] users` is clear: array of `User` — Dmitry Bychenko, Apr 10 '21 at 19:03

John Alexiou · Answer 1 · 2021-04-10T20:08:07.990

You cannot tell what it does from the name (other than "process"), but you can tell what inputs are expected and what outputs are produced

Inputs - An array of User type called users.
Output - An array of a tuple. This tuple has two fields an integer named UserId and a decimal named MaximumTotalInstallment. This type is equivalent to ValueTuple<int,decimal>.

Other notes, the method is static which means it is called not for a particular instance of a class, but callable (like a library) from anywhere else.

Process function definition c#

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