asm.js & wasm

asm.js

• subset of JavaScript, run in any js environment.
• emscripten generate plain js txt.
• only int and float type, operation on TypedArray for stucture data
• no gc
• need js engine optimize
• aot

binary data in js: ArrayBuffer object is used to represent a generic, fixed-length raw binary data buffer. You cannot directly manipulate the contents of an ArrayBuffer; instead, you create one of the TypedArray objects or a DataView object which represents the buffer in a specific format, and use that to read and write the contents of the buffer. So ArrayBuffer is the underlying data of TypedArray. This is true for Buffer in nodejs.

wasm

• standardization of asm.js
• emscripten generate bytecode (binary format).