No, that's not how it works - indexing a string returns a byte, and strings have len() their bytes in UTF8. Ranging a string does return unicode runes, however

No, that's not how it works - indexing a string returns a byte, and strings have len() their bytes in UTF8. Ranging a string does return unicode runes, however, but ranging is obviously O(n) anyway. https://play.golang.org/p/oyaChPTb576 https://play.golang.org/p/oyaChPTb576