Objective C vs Watki

Write and run real Objective-C code on your iPhone or iPad. Type a program, tap Run, and it is compiled with GCC and the GNUstep Foundation framework on a secure server. The output appears in seconds. It's a great way to learn Objective-C, try out an idea, or practise for an interview or exam, wherever you are. FEATURES • Code editor with Objective-C syntax highlighting, line numbers, bracket matching, undo and redo • Extra keys above the keyboard for [ ] { } ( ) @ ; # and other symbols • Clear compiler errors and warnings. Tap one to jump straight to the line • Give your program input to read with scanf or fgets • Save, rename, duplicate and share your programs • 14 example programs: classes, properties, strings, arrays, dictionaries, inheritance, protocols, categories, exceptions, memory management and more • Editor and output side by side on iPad • Dark Mode WHAT YOU CAN USE Foundation classes such as NSString, NSArray, NSDictionary, NSNumber and NSException, plus the C standard library. Memory is managed manually with retain, release and autorelease, as in classic Objective-C. UIKit and ARC are not available. Your programs are stored on your device. Code is sent to the server only to compile and run it, and is not kept.

Watki is an offline field guide to open graphics, compute and XR standards. Every call, built-in and type, with what it does, what it takes and where it fits, set in a quiet black-and-white reader that works without a connection. WHAT'S INSIDE 21 volumes and more than 12,000 entries, including: • Vulkan 1.4 and Vulkan SC 1.0, with extensions • OpenGL ES 2.0 to 3.2, OpenGL 4.6 core and OpenGL SC 2.0 • EGL 1.5 and WebGL 1.0 and 2.0, with extensions • OpenCL 3.0 and OpenCL C, SYCL 2020 and SPIR-V 1.6 • OpenXR 1.1, OpenVX 1.3.1, OpenVG 1.1 and ANARI 1.1 • The Slang core module • glTF 2.0, KTX 2.0, COLLADA 1.5 and NNEF 1.0.5 • Short overviews of machine learning and safety-critical work HOW IT READS • Each volume opens to its sections; each section lists its entries in groups you can jump between. • Entries show the signature, parameters, return values and the version or extension that added them. • Search across every volume at once. • Keep the entries you use most and come back to recent ones. • See how much of each volume you have read. MADE TO BE LOOKED AT A slow mist drifts behind the pages and changes with the time of day. You can thicken it, slow it, freeze it or give it a new pattern. In the darkroom you can develop any photo as a 1-bit print and save it. PRIVATE AND OFFLINE Everything ships inside the app. No account, no ads, no tracking and no data collected. SOURCES The reference text is generated from the published registries, headers and reference pages of each standard, under their licences. Full credits and licence details are in the app. Watki is an independent reader and is not affiliated with or endorsed by The Khronos Group or any other standards body. Vulkan, OpenGL ES, OpenGL SC, EGL, WebGL, OpenCL, SYCL, SPIR-V, OpenXR, OpenVX, OpenVG, ANARI, glTF, KTX, COLLADA, NNEF and Khronos are trademarks or registered trademarks of The Khronos Group Inc. OpenGL is a registered trademark of Hewlett Packard Enterprise, used under licence by Khronos. Slang is a trademark of its respective owner. All other names are the property of their owners and are used only to identify the standards described.