Question

Say I have a string var s = "123456789"

where

foreach(var c in DivideStr(s, 3)){
  Console.WriteLine(c);
}

would print out 123 , 456, 789

This is a fairly easy problem to accomplish with loop and if statement. But I want to accomplish with Take and Skip function in C# in the follow fashion

IEnumerable DivideStr(String s, Int n) 
{
   var a = s;  
   while(!a.IsEmpty())  
   {  
     yield return a.Take(n)  
     a = a.Drop(3) // or a.Skip(n)  
   }  
}

This way, if I have var s = "12345678"
The print out would be 123, 456, and 78

The problem is the above code won’t compile. What am I missing?

Answer 1

Try something like this

IEnumerable<string> splitstrings = Enumerable.Range(0, str.Length / 3)
        .Select(i => str.Substring(i * 3, 3));

Or this

List<string> splitstrings = (from Match m in Regex.Matches(str, @"\d{1,3}")
                   select m.Value).ToList();