Transitioning to Swift by Scott Gardner

By Scott Gardner

Constructing apps for Apple's broadening platform of units is an exhilarating subject nowadays. Apple created the speedy programming language to construct state of the art apps utilizing the newest Apple applied sciences. during this 200-page booklet, writer Scott Gardner articulates the similarities and modifications among conventional Objective-C established programming and rapid, revealing what you must understand from syntax alterations to rising most sensible practices and paradigm shifts, to jot down robust, expressive, and versatile code in quick. Written at a brisk speed and in a methodical sort, you are going to the best way to observe your Objective-C abilities to effectively transition to programming in speedy.

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Info 44 CHAPTER 3: Working with Strings and Collections Table 3-8. reduce(0, +) // 15 Working with Dictionaries Objective-C and Swift dictionaries work in similar ways, yet have some differences that will be noted first, followed by comparative examples in Table 3-9. Swift dictionaries have isEmpty and count computed properties just like arrays, the latter of which is also available in Objective-C as a property of NSDictionary and NSMutableDictionary instances. Objective-C’s –[NSDictionary allKeys] and –[NSDictionary allValues] methods that return NSArray instances (order unspecified) have corresponding keys and values computed properties for Swift dictionaries.

By default, ~= simply compares two values using the == operator. The pattern matching operator is included here, complete with setup code, however, coverage of that setup code (which involves creating a function to overload the ~= operator) is deferred to Chapter 6. info 58 CHAPTER 4: Performing Operations Table 4-7. info CHAPTER 4: Performing Operations 59 Table 4-7. Subclass Not an instance of Subclass */ as? N/A for value in arrayOfClassInstances { if let item = value as? info 60 CHAPTER 4: Performing Operations Operator Precedence and Associativity Precedence rules apply when an expression contains two or more binary operators and parentheses are not used to group and explicitly specify the order in which operations should be performed.

Info CHAPTER 4: Performing Operations Table 4-3. 5 q = 10 % 4; r = -10 % 4; s = 10 % -4; t = -10 % -4; &+ uint8_t w = g + 1; // w = 0 let w = g &+ 1 // w = 0 &- uint8_t x = h - 1; // x = 255 let x = h &- 1 // x = 255 &* uint8_t y = g * 2; // y = 254 let y = g &* 2 // y = 254 &/ uint8_t z = a / 0; // Division by zero is undefined let z = a &/ 0 // z = 0 &% uint8_t aa = 255 % 0; // Remainder by zero is undefined let aa = 255 &% 0 // aa = 0 ?? N/A let defaultSize = "M" var selectedSize: String? let orderSize = selectedSize ??

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