`String.prototype.symbolAt()` (improved `String.prototype.charAt()`)
brendan at mozilla.com
Sat Oct 19 12:11:33 PDT 2013
Allen Wirfs-Brock wrote:
> The use case that we don't support well is any sort of back wards iteration of the characters of a string. We don't current have an iterator specified to do it, nor do we have a one stop way to test whether we at looking at the trailing surrogate of a surrogate pair.
What do you mean by "one stop"? O(1)? We aren't going to mandate
implementations make such tests (or backward iteration) that cheap.
Is there yet a real world (from the field, not a testcase) use-case for
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