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In fact, the Swift compiler will stop you from trying to make or use a nil object with a compile-time error. This makes writing code much cleaner and safer, and prevents a huge category of runtime crashes in your apps. However, there are cases where nil is valid and appropriate.

For these situations Swift has an innovative feature known as optionals. An optional may contain nil , but Swift syntax forces you to safely deal with it using the? Use optionals when you might have an instance to return from a function, or you might not. Features such as optional binding, optional chaining, and nil coalescing let you work safely and efficiently with optional values.

From its earliest conception, Swift was built to be fast. Using the incredibly high-performance LLVM compiler technology, Swift code is transformed into optimized native code that gets the most out of modern hardware. The syntax and standard library have also been tuned to make the most obvious way to write your code also perform the best whether it runs in the watch on your wrist or across a cluster of servers. Swift is a successor to both the C and Objective-C languages.

It includes low-level primitives such as types, flow control, and operators. It also provides object-oriented features such as classes, protocols, and generics, giving Cocoa and Cocoa Touch developers the performance and power they demand. Swift can open doors to the world of coding. For educators, Apple created free curriculum to teach Swift both in and out of the classroom. First-time coders can download Swift Playgrounds—an app for iPad that makes getting started with Swift code interactive and fun.

Aspiring app developers can access free courses to learn to build their first apps in Xcode. Learn more about Swift education resources from Apple. Instead you can start using the new compiler and migrate at your own pace, taking advantage of new Swift 5 features, one module at a time. And Swift 5 now introduces binary compatibility for apps.

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That means you no longer need to include Swift libraries in apps that target current and future OS releases, because the Swift libraries will be included in every OS release going forward. Your apps will leverage the latest version of the library in the OS, and your code will continue to run without recompiling. This not only makes developing your app simpler, it also reduces the size of your app and its launch time.

Swift is developed in the open at Swift.

iOS 12 - Wikipedia

This broad community of developers, both inside Apple as well as hundreds of outside contributors, work together to make Swift even more amazing. Swift already supports all Apple platforms and Linux, with community members actively working to port to even more platforms. Swift is perfect for use in server apps that need runtime safety, compiled performance and a small memory footprint.

To steer the direction of Swift for developing and deploying server applications, the community formed the Swift Server work group. The first product of this effort was SwiftNIO, a cross-platform asynchronous event-driven network application framework for high performance protocol servers and clients. It serves as the foundation for building additional server-oriented tools and technologies, including logging, metrics and database drivers which are all in active development. To learn more about the open source Swift community and the Swift Server work group, visit Swift.

Much like Swift Playgrounds for iPad, playgrounds in Xcode make writing Swift code incredibly simple and fun. Type a line of code and the result appears immediately. You can then Quick Look the result from the side of your code, or pin that result directly below. The result view can display graphics, lists of results, or graphs of a value over time.

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With iOS 10, Apple introduced a feature that finally let you clear all notifications and alerts in one go. This method only applied to 3D Touch-equipped devices from the iPhone 6 S onward and entailed swiping down to reveal your notifications, then firmly pressing on the "X" on the right side of the screen to open a "Clear All Notifications" button for you to tap on. Amazingly, the jailbreak community already had a tweak available on their modded iPhones running iOS 9 that performed exactly the same function.

MohammadAG's tweak is fittingly named " 3D Touch to Clear Notifications ," to clear up any confusion regarding its purpose. Emojis have become an invaluable tool in the way we communicate with one another electronically, be it through texts, social media, or other platforms, to convey emotions and ideas using cute little characters in place of words. These cute icons had become so prevalent that it's hard to believe Apple didn't officially provide native support for its use until iOS 5 touched down alongside the iPhone 4 S.

The powerful programming language that is also easy to learn.

To give Apple credit, however, emojis weren't big worldwide until they were incorporated into Unicode, and the 4 S came out a year after that. However, the jailbreak community had a significant leg up on Apple with regards to emoji support.

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  8. Perhaps one of the most underrated features to be implemented within the iOS keyboard came in iOS 5 when Apple introduced keyboard "Shortcuts," which is now called " Text Replacement. If you're familiar with the world of jailbreaking, you probably weren't impressed when keyboard shortcuts made its way to iOS, as a well-known tweak has given modded iPhones the same exact functionality. And just like Apple's version, the Xpandr tweak from Nicholas Haunold worked system-wide and gave you shortcut capabilities across all apps, from Messages and Notes to Safari and more. Apple made significant improvements on the iPhone's keyboard with the release of iOS 8, chief among them being third-party keyboard integration.

    This meant that for the first time, third-party keyboard apps like TouchPal, SwiftKey, and Fleksy could be added via the Settings app and gave you features such as swipe-typing and customizable themes. Interestingly enough, the jailbreak community seemed to be the pioneers of third-party keyboard integration, as evidenced by tweaks like Fleksy Enabler , which gave jailbroken iPhones as far back as iOS 6 the ability to integrate the popular keyboard app system-wide. Another major enhancement to the iOS keyboard in iOS 8 was the introduction of the novel QuickType keyboard, which brought with it predictive text capabilities.

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    In a nutshell, QuickType has the ability to predict what you're going to type next in real time, producing words, phrases, and even appropriate replies to received texts to make typing even snappier, not to mention more intuitive. As great as QuickType is, calling it groundbreaking would be dubious at best. A tweak that enabled almost the same features had been available in Cydia since iOS 7, beating out Apple by about a year.

    And just like QuickType, PredictiveKeyboard by Matthias Sauppe added an additional row to the iOS keyboard to display its predictions and could learn new words and phrases with increased use. Since its official introduction on iOS 9 , the underrated cursor control feature turned the iPhone's keyboard into a trackpad using 3D Touch for extremely precise control over the cursor's placement for easier editing and revisions.

    If you're a fan of jailbreaking, you probably weren't impressed with the feature and wondered what took Apple so long to come out with it. The jailbreak community has had this functionality available as far back as iOS 4 thanks to the SwipeSelection tweak by Kyle Howells , which enabled you to move cursor simply by swiping on the keyboard.

    In some ways, SwipeSelection is better than Apple's trackpad mode, as it didn't require 3D Touch to enable and extended the feature to all jailbroken iPhones. Of course, in iOS 12, you no longer need 3D Touch either, but that took eight iOS versions to do what this tweak already could. For the longest time, one of the biggest issues with the iPhone's stock keyboard was it was visually locked to uppercase letters, which made it difficult to tell if you were typing in capital or small letters until you tapped on a key.

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    Most amazing of all, Apple stuck with the same system up until iOS 9, when it finally implemented lowercase letters on the keyboard for convenience. Before Apple fixed the issue, the ShowCase tweak from Lance Fetters was a fixture on many jailbroken iPhones, as it gave users this essential functionality which Apple took so long to roll out. As iOS smartphones got larger with the introduction of the iPhone 6 and 6 Plus, one-handed typing became a lot more challenging, especially if you had smaller hands. To address this, Apple introduced a keyboard setting in iOS 11 that allowed you to set further to either the left or right sides of the screen to make one-handed typing a lot more convenient.

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    With larger iPhones already available since iOS 8, however, it's safe to say that Apple's one-handed keyboard feature came three years too late. Thankfully, the jailbreak community stepped up to the plate and hit a home-run with the OneHandWizard by TheAfricanNerd a more advanced Reachability tool and sharedRoutine.

    The powerful programming language that is also easy to learn.

    In fact, the tweak took it much further than just one-handed keyboard functionality and applied this feature system-wide for enhanced accessibility. Of course, since there was official third-party keyboard support since iOS 8, many users could just download and use a keyboard like Word Flow from the App Store instead of using a jailbreak tweak, but it's still fair to say Apple didn't come up with the idea without inspiration from others developing apps and tweaks for iOS. With iOS 10, Apple introduced a feature for Messages that allows you to scribble out your message , from handwritten texts to simple drawings.

    This is accomplished simply by rotating your iPhone into landscape orientation within a conversation page inside the Messages app, then tapping on the draw button on the lower right. Additionally, there's Digital Touch , which lets you send animated drawings via an iMessage app. Apparently, the jailbreak community has long had a tweak that gave you the ability to write or draw messages to friends and loved ones. To make Messages even more fun and interactive, Apple officially introduced sticker support for its native messaging app on iOS With it, you're free to place little stickers and decorate your texts to your heart's content.

    While we're thankful to Apple for finally giving us the ability to pepper our messages with cute stickers, it's worth acknowledging its introduction was far from groundbreaking. The jailbreak community was way ahead of Apple in this regard and was the first to introduce stickers into Messages with the StickerMe tweak by Alexander Laurus back in iOS 8 , which used Facebook Messenger's stickers. It's hard to believe, but the ability to delete recent calls on an individual basis didn't arrive on the iPhone until iOS 5 was introduced.

    Before that, the only option you had was to delete all your recent calls in one go. So if you wanted the ability to delete calls one by one, your only option back then was to jailbreak your device and install a tweak like Call Delete from IArrays to enable deletion of specific numbers. With iOS 7, Apple finally gave you the ability to block phone calls , messages, or FaceTimes from specific numbers. Prior to that, the only way to block harassing or just plain annoying callers was through a jailbreak tweak appropriately called iBlacklist by spektro and hdsq2.

    The tweak was well ahead of its time, and just like with iOS 7, it had the ability to not only block phone calls but also extended to FaceTime calls, SMS, and iMessages. When it was first introduced in conjunction with the iPhone 4 and iOS 4, FaceTime was restricted to Wi-Fi only, which made FaceTime calls using your cellular data connection impossible without a jailbreak.