Bloom On Client Side: Linkery from WWDC 2014

Saturday, June 7, 2014

xcode 14 million downloads
objective C has served for 20 years, but what if we did it without baggage of C - "did more than think of it"
swift - fast, modern, interactivity
type inferences, closures, generics, multiple return types, name spaces
native to cocoa same lvm compiler, same arc memmory management, same run time
work beside objcective C in same application
Use of "playgrounds" within Xcode - running code as you write it showing sidebar, can see imagefunctional - closure on array elements
language guide (Swift eBook) and reference implementation available

Swift is like JavaScript in that a line break is enough to mark the end of a statement, and ending them with semicolons is optional
Swift associates types with variables. The compiler infers the variables’ types from the values assigned to them
Int, Float, Double, Bool, (whose values are true and false as opposed to Objective-C’s YES and NO) , String - forcing a Float type for what could be a double if type not specified - var someValue:Float = 3.0
function definition example: func circleArea(circleRadius: Double) -> Double

Playgrounds that allow you to experiment Swift and see the result in real-time. In other words, you no longer need to compile and run your app in the Simulator. As you type the code in Playgrounds, you’ll see the actual result immediately without the overheads of compilation.
Swift allows you to use nearly any character for both variable and constant names. You can even use emoji character for the naming
strings are represented by the String type - Whenever you assign a string as variable (i.e. var), the string can be modified in your code
Swift allows you to compare strings directly by using the == operator
Objective C you use the addObject: method of NSMutableArray to add a new item to an array. Swift makes the operation even simpler. You can add an item by using the “+=” operator
Swift only provides two collection types. One is arrays and the other is dictionaries.
You can define classes in a single file (.swift) without separating the external interface and implementation
Swift requires you to provide the default values of the properties or a ?.

Bloom On Client Side