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Journal Com2Kid's Journal: Why functions as first class objects rocks. (C#) 5

Journal by Com2Kid

Ok technically for the sake of type safety they are delegates, but the COOL part is that this:


z1 = z0 - ( f(z0) / f'(z0) )

math formula ends up looking like this:


newResult = previousResult - ( f(previousResult) / fprime(previousResult) );

code.

That is awesome in terms of sheer readability, compared to the insane amount of crud I'd have to go through to write that in Java.

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Why functions as first class objects rocks. (C#) More

Why functions as first class objects rocks. (C#)

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  • I am intrigued. Can you show some more code so I understand how it actually works?

    • Re: (Score:1)

      by Com2Kid ( 142006 )
      No problem. :-D

      I need to divide the results of two functions f(x) and f`(x), in other words, find f(x)/f`(x). The user can select f(x) and f`(x) from 3 different choices.

      1. f(x) = e^x - 2 - x
      2. f(x) = (x-2)2 - ln(x)
      3. f(x) = cos(x) + 1 - x

      (f(x) is chosen and f`(x) is automatically paired with it)

      I have a function, solver, that takes in two other functions as its parameters. To do this in C#, I create a delegate type. A delegate just tells .NET what the return type and parameter types of a set of re

  • Too bad most Real Programming jobs don't consist of writing mathematical formulas. Delegates are only really useful in C# for Win GUI forms.
  • I really don't see any reason why you can't do something similar in Java just as easily.

    • Re: (Score:1)

      by Com2Kid ( 142006 )
      You're right, this is all just syntactic sugar.

      In Java, I could make an abstract base class called MathFunction that had a single unimplemented method in it. I could then derive three concrete classes from this base class, each with a different implementation of that function. Then declare my variables to be of the base class type, and assign the more proper specific subtype to that initial variable.

      But that is a lot of work for one lonely little function. :-D Not to mention I then end up going

      MathFuncti

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