Programming Tutorials & Language References

Deep-dive guides for every major language. Tested code. Original benchmarks. No ads, no fluff — built for developers who want to understand how and why.

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12 examples
TypeScript Generics: Complete Guide from Basics to Advanced Patterns

TypeScript generics explained from first principles through advanced patterns. Covers generic functions, interfaces, classes, constraints, default type parameters, and the infer keyword.

8 examples
Go Goroutines and Channels: Concurrency From First Principles

A complete practical guide to Go goroutines and channels. Covers spawning goroutines, unbuffered and buffered channels, the select statement, goroutine leaks, and WaitGroup.

15 examples
Rust Ownership Explained: The Mental Model That Makes It Click

Rust ownership explained from first principles. Covers the three rules, move semantics, Copy types, borrowing, mutable references, lifetimes, and the borrow checker.

21 examples
SQL Window Functions: The Complete Guide with Real Examples

Master SQL window functions with 30+ real examples. Covers OVER, PARTITION BY, ROW_NUMBER, RANK, DENSE_RANK, LAG, LEAD, and moving averages. Tested in PostgreSQL and MySQL 8+.

18 examples
Python Type Hints: A Complete Guide with Examples

Master Python type hints from basic variable annotations to generics, Union types, TypedDict, Protocol, and Literal. Includes mypy setup and CI integration with 30+ examples.

9 examples
JavaScript Event Loop Explained: Tasks, Microtasks, and async/await

Master the JavaScript event loop: call stack, task queue, microtask queue, async/await execution order, and Node.js phases. Includes step-by-step code traces.