jerryscript VS just

JerryScript

I've been having a lot of fun with https://kalumajs.org/ recently for silly JS embedded things. It's been great so far, and has a cool little community!

It's a runtime built on top of JerryScript, which has been pretty neat to look into as well: https://jerryscript.net/

Jerryscript came to mind : https://github.com/jerryscript-project/jerryscript

I personally quite like JerryScript

I hear you loud and clear.

There are subsets of JS for embedded device e.g. Espruino https://github.com/espruino/Espruino for BangleJS https://shop.espruino.com/banglejs also with 4MB or JerryScript https://jerryscript.net

Fitbit uses Jerryscript in some of their watch OSes. Well, at least they were last time I was tinkering with making my own watch face

https://jerryscript.net/

- JerryScript (5.8k stars)

Nice comparison of js engines can be found in the issues here https://github.com/jerryscript-project/jerryscript/issues/43...

just

https://github.com/just-js/just Is another for a V8 runtime, it really shows how well optimized it is. https://www.techempower.com/benchmarks/#section=data-r21

i just tried recompiling v0.0.2 (https://github.com/just-js/just/releases/tag/0.0.2) of just-js and comparing it to current. for the completely static build on ubuntu 22.04 i see following:

0.0.2 (v8 v8.4.371.18) - file size: 15.2 MB, startup RSS: 8.4 MB

Not at all. Javascript, as well as java compiled into the bytecode, but just incrementally and at the runtime. You cannot compile typescript into bytecode directly (at least it intend to be like that). You can even compile js to executable (https://github.com/just-js/just). So no, typescript transpiles to javascript, whereas scala compiles to bytecode, it's different things

Trust me, these guys are insane and go to really extreme levels and use optimization techniques which are not generally prevalent among the general programming fraternity. for eg, look at pico.v it is awesome and just-js is truly unbelievable, then there is faf, most of them combine low level programming trickery to reach those insane numbers. Also some of the code may not be useful in a production app but they actually extract the juice out of the metal at every instance. Memory optimizations, compiler optimizations, postgresql wire implmentations, rust black magic, these guys are really crazy and passionate.

...and the fastest server is javascript.

https://github.com/just-js/just

Not that you should choose it over node or bun.sh or deno. I look forward to seeing where bun.sh ends up on the chart.

Currently (well, as of the last benchmark, in July) deno is 0.9%-1.6% of the speed of the fastest options, while faster node options are around 20-40%.

> I am stunned that a JS tool came out on top

I wanted to know why, and I found this article by the author:

https://just.billywhizz.io/blog/on-javascript-performance-01...

also: https://github.com/just-js/just/issues/5#issuecomment-778673...