[saurik]

You are assuming a compilation that results in high-level JavaScript code. As JavaScript is a Turing complete language, you can trivially compile any other programming language to target it, and we not only have done that a lot but even made it efficient using asm.js. All WASM is buying us is a more efficient encoding format that can be parsed more quickly than asm.js.

[esrauch]

> All WASM is buying us is a more efficient encoding format that can be parsed more quickly than asm.js.

That is only the initial property. WASM is expected to get a number of new features that aren't expected to come to JS, like actual threads.

[pjmlp]

It also applies to asm.js.

Just because it runs does not mean it does so efficiently, or that 100% of the source language semantics are supported without any constraints.