Quick Reference

Bash scripts: variables, quoting, arguments, conditions, loops, functions, string tricks and exit codes.

5 sections · 29 snippets

C essentials: types, printf/scanf, arrays, strings, pointers, structs, memory, files and compiling.

6 sections · 33 snippets

C# essentials: variables, strings, collections, LINQ, classes, records, async/await, exceptions and the dotnet CLI.

7 sections · 38 snippets

Modern C++: I/O, strings, vectors, maps, algorithms, classes, smart pointers, lambdas and compiling.

6 sections · 34 snippets

CSS selectors, the box model, flexbox, grid, typography, colors, responsive design, variables and animation.

6 sections · 45 snippets

Dart essentials (Flutter's language): variables, null safety, strings, collections, functions, classes and async.

5 sections · 24 snippets

Docker commands for images, containers, volumes, networks and Compose, plus a Dockerfile template.

5 sections · 31 snippets

Git commands for setup, saving changes, branching, merging, remotes, undoing mistakes and inspecting history.

7 sections · 43 snippets

Go essentials: variables, slices, maps, structs, interfaces, errors, goroutines, channels and the go tool.

6 sections · 39 snippets

HTML for page structure, text, links, images, lists, tables, forms, media and the document head.

7 sections · 43 snippets

Java essentials: types, strings, arrays, collections, control flow, methods, classes, records, streams and exceptions.

7 sections · 46 snippets

Modern JavaScript: variables, strings, arrays, objects, functions, async/await, classes, modules and the DOM.

10 sections · 85 snippets

Kotlin essentials: val/var, null safety, strings, collections, control flow, functions, data classes and coroutines.

5 sections · 27 snippets

Terminal commands for files, viewing and searching text, permissions, processes, networking, archives and packages.

7 sections · 55 snippets

npm commands for installing, updating and publishing packages, running scripts, and handy Node.js CLI flags.

4 sections · 22 snippets

PHP essentials: variables, strings, arrays, control flow, functions, classes, files, JSON and superglobals.

6 sections · 42 snippets

Everyday Python: variables, strings, lists, dicts, control flow, functions, classes, files and errors.

11 sections · 92 snippets

Regular expressions: character classes, anchors, quantifiers, groups, lookarounds, flags and ready-made patterns.

7 sections · 44 snippets

Ruby essentials: variables, strings, arrays, hashes, blocks, control flow, classes, modules and gems.

6 sections · 41 snippets

Rust essentials: variables, ownership and borrowing, strings, vectors, structs, enums, matching, traits, errors and Cargo.

6 sections · 34 snippets

SQL queries: SELECT, filtering, sorting, joins, grouping, inserts, updates, schema changes and transactions.

7 sections · 50 snippets

Swift essentials: constants, optionals, strings, collections, control flow, functions, closures, structs, classes and protocols.

5 sections · 27 snippets

TypeScript types: annotations, interfaces, unions, generics, utility types, narrowing and configuration.

8 sections · 52 snippets

Default Visual Studio Code keyboard shortcuts for Windows/Linux and macOS: editing, multi-cursor, navigation, search, panels and debugging.

9 sections · 79 snippets