Startup cost of meta programming? about lodash HOT 8 CLOSED

I did initial checks on this for v0.1.0 and it was within reason (initing the compiled functions was around the cost of say the jQuery.support object). I've since reduced the number of compiled methods and inlined the templates for production builds so times should be even better. I will do an official bench of this though.

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OK, I benched it again using a custom build with only the compiled methods crammed into a test loop so keep that in mind: http://jsperf.com/lodash-compile-cost

The custom build was made using

node build include=contains,every,filter,find,forEach,map,pluck,reduce,reject,some,values,defaults,extend,functions,isEmpty,keys

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How does this compare to the startup cost of underscore?

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Any chance of having the compiler build out the complete functions? I.e. do all the meta stuff at build time? If you keep the actual bytes on disk as repetitive as possible then gzipping will compress it nicely.

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How does this compare to the startup cost of underscore?

Considering the benchmark is testing the cost of one time method compiling you can assume because Underscore lacks compiled methods that it doesn't have that cost.

Underscore pays it's perf tax per execution of each method, while Lo-Dash pays its one time up front. The startup will vary for custom builds with less compiled methods too, but I don't believe the kitchen-sink startup cost is an issue at the moment.

Any chance of having the compiler build out the complete functions? I.e. do all the meta stuff at build time? If you keep the actual bytes on disk as repetitive as possible then gzipping will compress it nicely.

Yes, it is absolutely possible to inline the methods, I do this already for the iteratorTemplate. I will experiment with this to see if the results are beneficial.

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After some experimentation we have decided not to use lodash on mobile yet because of the startup time cost. So, if that can be solved it would be awesome.

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Yap, expect the "mobile" build to be committed soon.

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This thread has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.

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