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Table 3-2. , the first item is at index 0). Unlike Objective-C, in which arrays can only store objects, Swift arrays can store values of any type, and as Apple’s Swift language guide states repeatedly, an array should store values of the same type. info CHAPTER 3: Working with Strings and Collections 35 As with any variable or constant, a Swift array’s type can be inferred based on its contents if set during declaration, or it can be explicitly stated. Swift’s literal syntax for creating an array is the same as Objective-C’s literal syntax but without the @ prefix.
Table 4-1. info 52 CHAPTER 4: Performing Operations Table 4-2. Basic unary operators in Objective-C and Swift Objective-C Swift NSInteger a = 1; var a = 1 ++ NSInteger // b = 2, NSInteger // c = 2, b a c a = = = = ++a; 2 a++; 3 let b = ++a // b = 2, a = 2 let c = a++ // c = 2, a = 3 -- NSInteger // d = 3, NSInteger // e = 1, d a e a = = = = a--; 2 --a; 1 let d = a-// d = 3, a = 2 let e = --a // e = 1, a = 1 Table 4-3. 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 ??
However, the compiler will flag an error and thus prevent writing code that attempts to explicitly cast to a type that the stored value is not an actual instance of (or a subclass of in the case of class types). Casting a value does not change the value in any way. For class types, full access to the properties and methods of the downcasted class type will only be available for the scope of the cast. The type checking and casting examples in Table 4-7 include empty class, subclass, and structure definitions, and program control flow statements necessary to demonstrate these concepts.