Sharing Memory and Typed Arrays Across the JS/WASM Boundary
Master efficient data exchange between JavaScript and WebAssembly using linear memory, typed array views, and pointer-based ABIs.
The Boundary Problem
WASM functions only accept and return numbers. To pass strings, arrays, or structs you must work directly with WebAssembly.Memory — a single growable ArrayBuffer.
Linear Memory as a View
You read and write guest memory from JS by creating typed array views over the module memory buffer.
const mem = wasm.exports.memory;
const u8 = new Uint8Array(mem.buffer);
u8[0] = 65; // write a byte at offset 0All lessons in this course
- Asynchronous Operations with WASM
- Custom JavaScript Callbacks
- Error Handling & Exceptions
- Sharing Memory and Typed Arrays Across the JS/WASM Boundary