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WebAssembly adds new functionality to the browser runtime environment that isn't available to regular JavaScript. It was originally 1:1 with asm.js/JS but that

WebAssembly adds new functionality to the browser runtime environment that isn't available to regular JavaScript. It was originally 1:1 with asm.js/JS but that stopped being true relatively quick.

notriddle 7y ago
It's faster. That's literally it. There aren't any new I/O facilities.
- kevingadd 7y ago
  A few examples of things it adds that are not widely available in JS (if at all, or requiring awkward hacks/hints in JS), off the top of my head: int64 uint32 popcnt copysign reinterpret_cast equivalent (the js hack for this is abysmal) pthreads SIMD AOT compilation To be fair, it's been a while since I was last one of the authors of the webassembly spec, so I could be missing some things.
  - Bombthecat 7y ago
    Could ads be served with web assembly?
    - kevingadd 7y ago
      Yes, though I don't know if it makes sense to do it for any reason other than hiding from ad blockers.
      - Bombthecat 7y ago
        Well, for some it is the only reason needed...