On Oct 5, 2011, at 9:10 AM, Axel Rauschmayer wrote: >> The two concatenation approaches I know of are: >> 1. via += >> 2. push() into an array, join() it after the last push() >> >> (1) can’t possibly be efficient, >> >> Huh? Engines have optimized the hell out of 1 by essentially doing 2 under >> the hood. Even rhino's about a land a patch to do just that. >> >> but if (2) is OK on all(!) platforms, then a library would be OK. However, >> given how frequently this is used, I would like this to become part of the >> standard library. >> >> What exactly do you want supported? > > Something like Java’s StringBuilder. If, however, (2) collects the > concatenated substrings and only joins them on demand in current engines, > then there is indeed no need for such a thing.
(1) is faster on modern engines. I don't think we need to overdo it here. SunSpider already did :-/. /be
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