clojurescript 2021-07-03

Why is the upper expression roughly twice as fast in chrome?

(time (dotimes [i 10000000] ((fn [_]) :foo)))
(time (let [x (fn [_])] (dotimes [i 10000000] (x :foo))))

I ran this in http://app.klipse.tech/

jkxyz21:07:59

I have very little knowledge of compiler optimizations, but maybe because in the first expression, the closure of the immediately-invoked function is the same as the caller, so the JS compiler knows it can elide code which would modify the stack before entering the function

borkdude21:07:46

could be!

Aron07:07:57

don't microbenchmark javascript jit compilers

2021-07-03

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