WebAssembly · Easy

Lesson 1 · On the house

Tables and call_indirect

funcref table, elem init, call_indirect for dynamic dispatch.

Lesson 2

Start function and init order

start section runs once at instantiate; data/elem before start.

Lesson 3

Multi-value returns

Multiple results and params in wat; stack tuple patterns.

Lesson 4

Bulk memory ops

memory.copy, memory.fill; active vs passive data segments.

Lesson 5

Reference types sketch

externref host handles; funcref; no full GC claim.

Lesson 6

Threads and atomics overview

shared memory, i32.atomic.* sketch; SharedArrayBuffer needs.

Lesson 7

SIMD overview

v128 vectors, lane ops; when SIMD pays off.

Lesson 8

WASI preview1 sketch

fd_write hello; portable WASI vs browser hosts.

Lesson 9

Debugging and validation

wasm-validate, trap kinds, name section and source maps.

Lesson 10

Size and speed craft

wasm-opt/Binaryen, strip exports, when WASM beats JS.