By Apple Computer Inc.

This can be the reliable consultant and reference for Apple's new fast programming language, intended as a substitute for the Objective-C programming language.

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Swift is a brand new programming language for growing iOS and OS X apps. fast builds at the better of C and Objective-C, with out the restrictions of C compatibility. fast adopts secure programming styles and provides sleek positive aspects to make programming more straightforward, extra versatile, and extra enjoyable. Swift’s fresh slate, subsidized via the mature and much-loved Cocoa and Cocoa contact frameworks, is a chance to reimagine how software program improvement works.

This ebook provides:
- A journey of the language.
- an in depth advisor delving into every one language feature.
- a proper reference for the language.

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Extra resources for The Swift Programming Language

Sample text

The row height should be 50 pixels taller than the content height if the row has a header, and 20 pixels taller if the row doesn’t have a header: let contentHeight = 40 let hasHeader = true let rowHeight = contentHeight + (hasHeader ? 50 : 20) // rowHeight is equal to 90 The preceding example is shorthand for the code below: let contentHeight = 40 let hasHeader = true var rowHeight = contentHeight if hasHeader { rowHeight = rowHeight + 50 } else { rowHeight = rowHeight + 20 } // rowHeight is equal to 90 The first example’s use of the ternary conditional operator means that rowHeight can be set to the correct value on a single line of code.

Max // maxValue is equal to 255, and is of type UInt8 The values of these properties are of the appropriate-sized number type (such as UInt8 in the example above) and can therefore be used in expressions alongside other values of the same type. Int In most cases, you don’t need to pick a specific size of integer to use in your code. Swift provides an additional integer type, Int, which has the same size as the current platform’s native word size: On a 32-bit platform, Int is the same size as On a 64-bit platform, Int is the same size as Int32.

Let assumedString: String! " You can think of an implicitly unwrapped optional as giving permission for the optional to be unwrapped automatically whenever it is used. Rather than placing an exclamation mark after the optional’s name each time you use it, you place an exclamation mark after the optional’s type when you declare it. NOT E If you try to access an implicitly unwrapped optional when it does not contain a value, you will trigger a runtime error. The result is exactly the same as if you place an exclamation mark after a normal optional that does not contain a value.

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The Swift Programming Language by Apple Computer Inc.


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