Advantages of using extension methods in functional programming

Method chaining in functional programming relies on extension methods. As we have already discussed in Chapter 1, Tasting Functional Style in C#, method chaining will make our code easier to read since it can decrease the lines of code. For the sake of code readability in the extension method, let's take a look at the following code, which we can find in the CodeReadability.csproj project:

using System.Linq; 
namespace CodeReadability 
{ 
  public static class HelperMethods 
  { 
    public static string TrimAllSpace(string str) 
    { 
      string retValue = ""; 
      foreach (char c in str) 
      { 
        retValue +=!char.IsWhiteSpace(c) ?c.ToString() :""; 
      } 
      return retValue; 
    } 
    public static string Capitalize(string str) 
    { 
      string retValue = ""; 
      string[] allWords = str.Split(' '); 
      foreach...