Introduction to functional programming in C #
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Functional programming is a style of writing source code that is not based on commands to be executed sequentially or in a certain order, but on the results of mathematical expressions (ie on functions). A function, as we well know, has as input a number of topics, which may also be other functions
Consider a simple loop that iterates over the numbers from 0 to 10 and displays them on the console.
The functional approach is as follows
for (Int32 i = 0; i <10; i + +)
Console.WriteLine (s);
Now let's see how to get the same result using functional programming. To do this you must create a helper method (ForEach <T>) in order to perform an action on each element of a collection (IEnumerable <T>) but also a function that returns a range of elements (Enumerable.Range ())
public static class EstensioneFunzionale
{
public static void ForEach <T> (IEnumerable <T> element, Action <T> Run)
{
foreach (T item in the item)
Run (item);
}
}
public static class Enumerable
{
public IEnumerable <Int32> Range (Int32 from, Int32 to)
{
for (int i =, i <a, i + +)
return i;
}
}
After defining the above functions we can achieve the same net effect of non-functional with the following code
class Program
{
static void Main (string [] args)
{
EstensioneFunzionale.ForEach (Enumerable.Range (0, 10), View);
}
public void Show (Int32 i)
{
Console.WriteLine (s);
}
}
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