Nim Demo Examples

Practice programs, one file each. Every demo is self-contained — copy it, modify it, run it. Each one imports only the standard library, so nothing else needs installing.

How to use: click View to open a file in the code viewer, read its comments, download it to your machine, and compile it with the Nim toolchain. Most demos need only nim c -r <file>; the threads demo needs the default --mm:orc, and the build-modes demo is worth running three times with different defines.

nim c -r 01_hello.nim                       # compile and run (debug build)
nim c -r -d:release 19_buildmodes.nim       # same source, optimized build
nim c -r 15_threads.nim                     # threads are on by default in Nim 2.x
nim c -r 16_interop.nim                     # links against libc (math.h, stdlib.h)

Foundations

Values, control flow and routines — the whole of PHASE 1 and PHASE 2.

#	Description	Link
1	Hello, World and echo	View
2	Values, Variables and Types	View
3	Selection and Iteration	View
4	Procedures and First-Class Functions	View

Data Modelling

Objects, variants, containers and text — PHASE 3, where data structures become the design.

#	Description	Link
5	Objects and Dynamic Dispatch	View
6	Enums, Sets and Variant Objects	View
7	Arrays, Sequences, Sets and Tables	View
8	Strings, Characters and Formatting	View

Abstraction & Reuse

Generics, modules, iterators and metaprogramming — PHASE 4, the machinery that lets one program serve many cases.

#	Description	Link
9	Generics and Type Classes	View
10	Modules and Imports	View
11	Inline and Closure Iterators	View
12	Templates and Macros	View

Safety & Performance

Errors, memory, concurrency and the C boundary — PHASE 5, where a correct program becomes a fast, reliable one.

#	Description	Link
13	Exceptions, defer and Option	View
14	Value vs Reference Semantics	View
15	Threads, Channels and Async	View
16	C Interop and Static Libraries	View

Engineering Practice

Tests, file I/O, build modes and project configuration — PHASE 6, how the work ships.

#	Description	Link
17	Unit Tests with std/unittest	View
18	Files, Paths and Command-Line Options	View
19	Build Modes and Runtime Checks	View
20	Project Configuration (config.nims)	View