Re: 30x faster JSON date parsing
Re: 30x faster JSON date parsing
- Subject: Re: 30x faster JSON date parsing
- From: Marcel Weiher <email@hidden>
- Date: Mon, 09 Sep 2013 19:14:55 +0200
Hi Jens,
Premature optimization is the root of all evil!
Er, I misspelled: “very cool, nice job!”
On Sep 9, 2013, at 18:11 , Jens Alfke <email@hidden> wrote:
> [..]
> [fg160,160,160;16:34:40.488| [fg0,128,0;[;NSDateFormatter took 26.97 µsec
> [fg160,160,160;16:34:48.649| [fg0,128,0;[;CBLParseDate took 0.47 µsec (58x)
>
> Now, the tradeoff is that the optimized code parses only ISO 8601 dates — this is the informal standard used with JSON, so it’s become really common. It looks like “2013-09-09T17:52:12Z”.
That might actually be a feature. (Also: didn’t know ISO did informal standards…)
>
> [1] http://vombat.tumblr.com/post/60530544401/date-parsing-performance-on-ios-nsdateformatter-vs
> [2] https://github.com/couchbase/couchbase-lite-ios/blob/master/Source/CBLParseDate.c
Marcel
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