More efficient way to get all indexes of a character in a string

Question

Instead of looping through each character to see if it\'s the one you want then adding the index your on to a list like so:

     var foundIndexes = new List&         


        

Answer 1

How about

string xx = "The quick brown fox jumps over the lazy dog";

char search = 'f';

var result = xx.Select((b, i) => b.Equals(search) ? i : -1).Where(i => i != -1);