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That's where high-level languages help. Here, instead of a one-to-one relation between what the programmer writes and what the computer does, a programmer can write a given command, and that will result in the computer possibly doing multiple things. High-level languages are a lot more like real languages in that they have syntax and a formal structure with some nuance. Imagine telling someone to get you a soda from the fridge. In a high-level language, you'd say, "Get off the couch and get me a soda from the refrigerator" and the person would figure out how to do that. With a low-level language, you'd need to say something more like, "Place both feet on the floor. Use your arms to stand up from the sofa. Place your right foot in front of your left foot, now your left foot in front of your right foot.." You get the picture. Every single discrete action between the couch and kitchen would need to be described exactly.
C is a classic high-level programming language, and a flavor of it, Objective-C, has traditionally been Apple's language of choice, Amazingly, Objective-C been around for over 30 years, and C itself for over 40, You can imagine that it might be time for something new, Among these programming languages there is a subset called a "scripting" language, This distinction is a little harder to v moda iphone case explain, but bear with me, Basically, a traditional high-level programming language needs to be compiled before anything will happen, Compiling is when all those commands (like "go to" or "get") are translated into specific instructions that the computer can understand..
The syntax is split apart from something a human can read into something a computer can read and, if all goes well, the result of that is an application that actually does something -- ideally, the thing you wanted it to. This compilation process is often slow, and it needs to complete before you can see whether the program you've written works. Any little glitch in your syntax often won't be identified until well into the compilation process, slowing down the development process. A scripting language, on the other hand, executes as it goes, line-by-line. You can see the results more easily as you're writing it, and you don't need to sit around and wait for compilation. This makes development fast and (relatively) easy, but often scripting languages are limited in their abilities -- they're typically used for simpler stuff. More problematic, their performance is often limited. This won't do in many cases.
Python is an example of a language that is commonly used for scripting, and indeed it's the language that Apple compared against onstage at WWDC, Scripting languages, like Python, tend to be easy to write and easy to test, but they aren't particularly powerful and generally v moda iphone case don't perform well, Not ideal when you're writing, say, a game that needs access to the full power of your device, Traditional programming languages, like Objective-C, give better access to the power of the device and enable the creation of more comprehensive apps, but are difficult to learn and tedious to compile and test..
Swift promises to have all the good with none of the bad. Apple promises that, at least in a few key benchmarks, it is considerably faster to execute than Python and faster even than Objective-C. But, despite that, the language supports what's called "playgrounds" within the Xcode developer environment, visualizing Swift code in real-time, like a scripting language. As an example today, a developer wanted to make a game where a balloon moved up and down in a regular pattern. To do that, he wanted to use a simple mathematical function -- sine, which you may remember from your trigonometry days. Sine gives you a nice waving arc, above and below zero, which is perfect for a floaty balloon.
In Swift, the developer was able to assign the value of sine to the balloon easily, and then see how that value changes over the execution of the app in a simple line chart, This makes it incredibly easy to visualize how that balloon is going to move so that if that's not appropriate, that can be changed immediately, Traditionally, the developer would have to run code through a compiler and then execute it and hope for the best, That process, depending on the size of the app, can v moda iphone case take anywhere from a few seconds to a few minutes or more..
Having the ability to quickly and easily test an app as you write it has the potential to let developers create complex apps more quickly. The compilation and testing process can become hugely cumbersome on a sizable app. If Swift can make a major impact there, as it seems to, that will enable application developers to release more thoroughly tested apps more quickly. Additionally, Swift is a very terse language. That is, much like Python, you don't need to write a lot to get a lot done. This, too, could speed up app development.
Finally, if Swift proves to create apps that execute more quickly than those in Objective-C, we could see even more impressive graphics in games (with the help of Apple's new Metal interface, which is another can of worms) and more responsive behavior from other apps, all without having to buy a new phone, It's not all roses, and the big immediate concern -- which was echoed by a few developers that I spoke with -- was the requirement to learn a whole new language, Coders in general enjoy mastering the latest and greatest, But there's an entire industry that has sprung up around teaching people how to write iPhone apps, All that, effectively, goes out the window as of today, (Yes, v moda iphone case you can continue to create Objective-C apps, but nobody's going to want to.)..