Kotlin Recipes vs CraftOS

Tap Run and the real output appears right under the code, so you know what it does before it goes into your project. No Kotlin to install, no IDE, no setup, no account. 390+ short examples, one task each. Over 95% run on Kotlin 2.4. You know what you need, but not the exact syntax: • How do I fall back to a default value when a variable is null? • How do I return two values from a function? • How do I merge two maps? Each has a working example here. • 24 sections, including strings and dates, collections, nullable types, classes and interfaces, enums, generics, extension functions, lambdas, exception handling, regular expressions, multithreading, files, JSON and XML, algorithms, and design patterns. • What changed from Kotlin 1.4 to 2.0, with before-and-after code: value classes, sealed interfaces, data objects and the improved smart casts in Kotlin 2.0. • Reference, 320+ entries: keywords and standard library functions for strings, collections, files, and coroutines. Tap a word in the code to look it up. • 200+ SQL queries: JOIN, GROUP BY, subqueries, window functions; more than half run on a practice database. • Search looks inside the code: type joinToString to find every example that uses it. • Edit an example and run your version, or write your own. • Works on iPhone, iPad, and Mac. • Everything except running code works offline. Free version: 210+ Kotlin examples and 120+ SQL queries, the full reference, and 12 runs and 12 edits a day (Kotlin and SQL runs share one limit). Full version: all examples and queries, unlimited edits and examples of your own, and up to 30 Kotlin and 80 SQL runs a day. One-time purchase, no subscription. Built by a developer for developers. The project behind it has been in active development since 2015.

CraftOS-PC is a fantasy terminal that allows you to write and run programs inside an ‘80s-style text console. CraftOS-PC emulates the popular Minecraft mod "ComputerCraft", which adds programmable computers to Minecraft using the Lua programming language. CraftOS-PC takes this experience outside Minecraft to allow you to run the same programs anywhere you go. CraftOS-PC provides a set of functions (called APIs) that make it super easy to do simple tasks such as write text to the screen, read files, and more. The simplicity of these functions makes CraftOS-PC great for new programmers, but their power makes it possible to write all sorts of complex programs with less code. If you aren’t ready to write programs yet, there’s already a large number of programs for ComputerCraft that will work in CraftOS-PC, ranging from simple games to whole graphical operating systems. These can be downloaded through the built-in Pastebin and GitHub Gist clients. • Full Lua 5.2+ scripting environment and command-line REPL • 16-color text-based terminal display • Expansive virtual filesystem for program and data storage • Built-in shell with syntax similar to most desktop shells • APIs to easily access terminal, filesystem, Internet, event queue, and more • Built-in programs make it easy to navigate & edit files without a single line of code • Plenty of help documents to assist programmers • Compatibility with thousands of existing ComputerCraft programs • Over 3x faster than Minecraft mod and comparable emulators • Emulation of all peripherals available in ComputerCraft • Easily access configuration from inside CraftOS • Exclusive graphics mode providing up to 256-color, pixel-based screen manipulation • Edit Lua scripts from CraftOS or other code editing apps • Open-source app makes it easy to suggest and contribute changes Documentation on all of the APIs that ComputerCraft provides are available at https://tweaked.cc, and CraftOS-PC’s unique APIs are described at https://www.craftos-pc.cc/docs/. Join the CraftOS-PC community at https://www.craftos-pc.cc/discord!