In this podcast Wes Reisz talks to Colin Eberhardt, the Technology Director at Scott Logic, talks about what WebAssembly (WASM) is, a bit of the history of JavaScript, information about WebAssembly, and plans for WebAssembly 2.0 including the threading model and GC.

Why listen to this podcast:

- WebAssembly brings another kind of virtual machine to the browser that is a much more low-level language.

- One of the goals of WebAssembly is to make a new assembly language that is a compilation target for a wide range of other languages such as C++, Java, C# and Rust. C++ is highly mature, Rust is maturing rapidly. Java and C# are a little further behind because of the lack of garbage collection support in WebAssembly. At some point in the future WebAssemblywill have it’s own garbage collection perhaps by using the Javascript garbage collector.

- At runtime you use JavaScript to invoke functions that are exported by your WebAssembly instance. It should be noted that at the moment there is quite a lot of complexity involved in interfacing between WebAssembly and JavaScript. A lot of this complexity comes from the type system.

- WebAssembly only supports four types - 2 integer types and 2 floating point types. To model strings you share the same piece of linear memory - memory that can read from and write to from both WebAssembly and JavaScript.

- WebAssembly is still a very young technology. Future plans include threading support, garbage collection support, multiple value returns.

More on this: Quick scan our curated show notes on InfoQ https://bit.ly/2G8QtzB

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