shortest way to get first char from every word in a string

Question

I want a shortest way to get 1st char of every word in a string in C#.

what I have done is:

string str = \"This is my style\";
string [] output = str         


        

Answer 1

var firstChars = str.Split(' ').Select(s => s[0]);

If the performance is critical:

var firstChars = str.Where((ch, index) => ch != ' ' 
                       && (index == 0 || str[index - 1] == ' '));

The second solution is less readable, but loop the string once.