Nim · Expert

Lesson 1 · On the house

Building ASTs in macros

Construct NimNodes with newTree, newCall, ident, and newLit, and walk typed arguments.

Lesson 2

A DSL with macros

Turn a declarative block into code: a small routing table and state machine generated at compile time.

Lesson 3

Lifetime hooks

Custom =destroy, =copy, =sink, and =wasMoved for resource-owning types.

Lesson 4

C interop

importc, header, cstring, varargs, and wrapping C functions safely.

Lesson 5

The effect system

func and noSideEffect, raises lists, tags, and gcsafe for checked guarantees.

Lesson 6

Custom pragmas and introspection

Annotate fields with your own pragmas and read them with hasCustomPragma and getCustomPragmaVal.

Lesson 7

Unsafe code: ptr, addr, and cast

Raw pointers, address-of, pointer arithmetic via UncheckedArray, and reinterpretation with cast.

Lesson 8

static parameters and generic specialization

static[T] values in types, compile-time sizes, and overloads chosen per type.

Lesson 9

Testing and assertions

std/unittest suites, check vs require, doAssert vs assert, and testament.

Lesson 10

Packaging, build flags, and release builds

nimble projects, config.nims, -d:release vs -d:danger, LTO, and cross-compiling.