Error Handling & Exceptions

When your WebAssembly (WASM) module interacts with JavaScript, things can go wrong. Maybe a calculation fails, an input is invalid, or a browser API call doesn't work as expected.

Proper error handling ensures your application remains stable and provides meaningful feedback to users or developers. It's about gracefully managing unexpected situations across language boundaries.

WebAssembly itself doesn't have a concept of "exceptions" like JavaScript or Java. Instead, languages compiled to WASM (like Rust or C++) often use return types or specific data structures to signal errors.

• Rust: Employs the Result<T, E> enum, which can be either Ok(T) for success or Err(E) for failure.
• C/C++: Often uses return values (e.g., -1 for error) or sets global error indicators.

Our focus is on how these language-specific error patterns translate across the WASM-JavaScript boundary.