c# extensions

     
//A. allows value.In("one", "two" , "tree") 
public static bool In<T>(this T source, params T[] list) 
{ 
  if(null==source) throw new ArgumentNullException("source"); 
    return list.Contains(source); 
} 
 
//#B Enable quick and more natural string.Format calls 
public static string F(this string s, params object[] args) 
{ 
   return string.Format(s, args); 
} 
 
// like this one "lala {1} ".F(one, two) 
 
//#C nice comparison tool : 
public static bool Between<T>(this T actual, T lower, T upper) where T : IComparable<T> 
{ 
    return actual.CompareTo(lower) >= 0 && actual.CompareTo(upper) < 0; 
} 
 
//Allows to have : 
if (myNumber.Between(3,7)) 
{ 
  // .... 
} 
 
//#D a map function 
    public static void ForEach<T>(this IEnumerable<T> @enum, Action<T> mapFunction) 
    { 
        foreach (var item in @enum) mapFunction(item); 
    } 
 
//allows to run function for every element  
// like this one : 
new { itemA, itemB, itemC } 
    .ForEach(item => { 
        item.Number = 1; 
        item.Str = "Hello World!"; 
});