RE:yield

Replying to this post about the use of yield, here is an everyday practical example: split a string to lines of text (by newline).

(I do like comparisons, so here’s the Python version too):

C#(xUnit)

        1: static IEnumerable<string> SplitLines(string input)

       2: {

       3:     while (true)

       4:     {

       5:         int idx = input.IndexOf(Environment.NewLine); 

       6:  

       7:         if (idx < 0)

       8:         {

       9:             yield return input;

      10:             break;

      11:         } 

      12:  

      13:         yield return input.Substring(0, idx);

      14:         input = input.Substring(idx + Environment.NewLine.Length);

      15:     }

      16: }

Python

       1: def split(str):

       2:     while True:

       3:         idx = str.find('\n');

       4:         if(idx < 0):

       5:             yield str

       6:             break

       7:         

       8:         yield str[0:idx]

       9:         str = str[idx+1 :]