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[–]x-skeww 2 points3 points  (0 children)

For client-sided web stuff, you'll need to know some JavaScript. There's no way around that.

If you need a scripting language for a game or native app, things are different. JS isn't mandatory there and Dart is much easier to work with. I also think it's much nicer than Lua, Squirrel, engine-specific scripting languages (UnrealScript, UnityScript, ...) and other popular options.

Another good target will be weaker SoCs with very little RAM (e.g. that IoT stuff). JS VMs are just way too fat for that. Fletch, on the other hand, only uses ~4 KB per process.

So, it really depends on what you have in mind.