On 02/10/16 04:41, Lloyd Fournier wrote: > String concat takes On2 in rakudo I think. Using join in this kind of > situation should be an improvement. (I'm commuting so can't test).
MoarVM implements "ropes" which make the performance a whole lot better. join can still be a small improvement, but not as much as it would if string concat was actually O(n^2).
