created swift programming language

The-swift-programming-language learning notes, swiftlanguageConstants and variables Constants cannot be modified. constants defined in classes can be assigned values in constructors. Let ModifierVariables can be modified. Var ModifierTraversal of characters in a stringFor code in string {}For codeunit in string. unicodeScalars {}Control statement Break jump out o

always referenced to each other and destroyed at the same time. Conversely, when possession references may sometimes say nil, the possession within the closure is defined as weak. A weak reference is always an optional type.A weak reference is used when all two attribute values are optional and may be nilOnly one of the two attributes is an optional type, and may be nil when using a non-primary referenceTwo attributes must have a value to use a non-primary reference and implicitly expand an opt

Swift programming language entry objects and Classes You can use class to create a class. An Attribute declaration is declared as a constant or variable in the class, except in the context of the class. The same is true for methods and functions. Class Shape {var numberOfSides = 0 func simpleDescription ()-> String {return "A shape with (numberOfSides) sides ."}}

, amount:int) { = operation = amount } func Execute (calculator:calculator) { operation (Calculator) (amount) } }In this class I define a type alias named Operationtype, as you can see from the definition that an instance of the Operationtype type is a closure that accepts an instance of a calculator type and returns a type of INT- > void Closure (the type of this closure is the type of each method in Calculator);Amount the value of the parameter to perform that

I shared the playground of Swift 2.0, which was collated on GitHub. Address Https://github.com/mengxiangyue/The-Swift-2.0-Programming-Language-playgroundCorresponds to the latest release of the SWIFT programming

The swift Programming Language Reading Notes on the seventh page contains two main content: print the output and how to comment out code 1 in swift how to print the value of variables and constants? Use the println function. For details, the println function outputs a line feed in addition to the variable constant valu

(Justthestatuscode, _) = Http404error// output "The status code is 404"println (" The status code is \ (justthestatuscode)") A single element in a tuple can be accessed by subscript, with the subscript starting from zero. // output "The status code is 404"println ("Thestatus code is \ (http404error.0)") // output "The status message is not Found"println ("Thestatus message is \ (Http404error.1)" /c11>) You can name a single element when you define a tuple, and you can get the value of a

Swift Programming Language -- Optional chain (Optional Chaining), swiftoptional Optional Chaining is a process that allows you to request and call attributes, methods, and subscripts, its self-sufficiency is reflected in that the current request or call target may be null (nil ). If the self-determined target has a value, the call will succeed. On the contrary, i

How to Build the swift language development environment ~ Helping the customer's house make up fat makes it possible to build a swift language programming environment. SWIFT, a new development

The UbuConSummit2016 summit has come to an end, and many Ubuntu developers have returned to work to continue their great development journey. According to foreign media SoftPedia, the developer DidierRoche released a new version of the tumake tool today. Many new features have been added to the latest version 16.01.2, such as support for Apple's open-source Swift programming

property, because the type itself cannot be assigned a value for the Type property during initialization by using the constructor.Type attribute syntaxIn C or objective-c, static constants and static variables are defined by a specific type plus globalkeyword. In the Swift programming language, a type attribute is written as part of a type definition in curly br

, the subscript index value may be too small or too large.You need to pass a value to the function. However, illegal values can cause the function to not execute properly.An optional value is now nil. However, the subsequent code execution requires a non-nil value.Please refer to the attached scripts and functions.Attention:Assertions can cause your app to terminate execution, so you should design your code carefully so that illegal conditions do not appear. However, there are times when illegal