keks

Code snippets curious to (at least) non-expert programmers

Snippets

C: Generate functions at runtime

It is not obvious how to create new functions at runtime in pure C (e.g. implement closures), however it's possible with some assembly code.
Javascript: Arbitrary-precision floating-point arithmetic

Impements floating-point arithmetic for any given number of bits for exponent and fraction (including denormalized numbers, NaNs, etc.). Supports comparison, +, -, *, /, sqrt, sin, cos. Calculation methods are not optimal (this is a proof-of-concept).
Bash, Windows CMD: Arbitrary-precision unsigned integer arithmetic

Implements +, -, *, div, mod, and sqrt operations for arbitrary-precision unsigned integers in pure Bash and in pure Windows CMD script (*.bat).
Python: Add methods to built-in types

That's possible with either a hack with garbage collector references or Python C API. See forbiddenfruit and dontasq for practical use.
C++: Calculate factorial at compile-time

Uses template specialization.

Stash of fun code snippets

Language:JavaScript 60.6%Language:Batchfile 23.6%Language:Shell 13.0%Language:C 1.9%Language:C++ 0.8%