On 11/13/13 8:23 PM, "labri...@digitalprimates.net" <labri...@digitalprimates.net> wrote:
>>No idea. I was trying to think of any danger of manipulating the >>returned string if it is the original and not always a copy, but I can't >>think of anything off-hand. > >>Is it much faster to add the check and return the original? > > >Aren't AS strings immutable anyway? So, the method got a copy to begin >with from the stack, but it is always a copy so, if the check is any >faster, returning the original shouldn't be able to cause an issue. I don't really know how it works. I think Strings are effectively immutable because there is no "in-place" manipulation APIs (no setCharAt). I don't think you get a copy on the stack, but I could be wrong, I thought you just got the pointer/reference, but someone could verify that with a profiler. I also don't know if there is a quick check inside String.slice that returns the original if the indexes indicate the entire string. -Alex
