Was Ist Die Swift

Use the rawValue property to access the raw value of an enumeration case. Use the init? It returns either the enumeration case matching the raw value or nil if there is no matching Rank.

The case values of an enumeration are actual values, not just another way of writing their raw values. Notice the two ways that the hearts case of the enumeration is referred to above: When assigning a value to the hearts constant, the enumeration case Suit.

Inside the switch, the enumeration case is referred to by the abbreviated form. If an enumeration has raw values, those values are determined as part of the declaration, which means every instance of a particular enumeration case always has the same raw value.

Another choice for enumeration cases is to have values associated with the case—these values are determined when you make the instance, and they can be different for each instance of an enumeration case.

You can think of the associated values as behaving like stored properties of the enumeration case instance.

For example, consider the case of requesting the sunrise and sunset times from a server. The server either responds with the requested information, or it responds with a description of what went wrong.

Add a third case to ServerResponse and to the switch. Notice how the sunrise and sunset times are extracted from the ServerResponse value as part of matching the value against the switch cases.

Use struct to create a structure. Structures support many of the same behaviors as classes, including methods and initializers. One of the most important differences between structures and classes is that structures are always copied when they are passed around in your code, but classes are passed by reference.

Write a function that returns an array containing a full deck of cards, with one card of each combination of rank and suit. Use protocol to declare a protocol.

Add another requirement to ExampleProtocol. What changes do you need to make to SimpleClass and SimpleStructure so that they still conform to the protocol?

Notice the use of the mutating keyword in the declaration of SimpleStructure to mark a method that modifies the structure.

Use extension to add functionality to an existing type, such as new methods and computed properties. You can use an extension to add protocol conformance to a type that is declared elsewhere, or even to a type that you imported from a library or framework.

Write an extension for the Double type that adds an absoluteValue property. You can use a protocol name just like any other named type—for example, to create a collection of objects that have different types but that all conform to a single protocol.

When you work with values whose type is a protocol type, methods outside the protocol definition are not available. Even though the variable protocolValue has a runtime type of SimpleClass , the compiler treats it as the given type of ExampleProtocol.

You represent errors using any type that adopts the Error protocol. Use throw to throw an error and throws to mark a function that can throw an error.

If you throw an error in a function, the function returns immediately and the code that called the function handles the error. There are several ways to handle errors.

One way is to use do - catch. Inside the do block, you mark code that can throw an error by writing try in front of it.

Inside the catch block, the error is automatically given the name error unless you give it a different name. Change the printer name to "Never Has Toner" , so that the send job:toPrinter: function throws an error.

You can provide multiple catch blocks that handle specific errors. You write a pattern after catch just as you do after case in a switch.

Add code to throw an error inside the do block. What kind of error do you need to throw so that the error is handled by the first catch block?

What about the second and third blocks? Ein Konto? Schufa Auswirkungen Wie funktioniert Cashback? Cashback, was ist das? Die 3 steht hier zum Beispiel für die Ostküste und die 6 für die Westküste.

Denn die Banken benutzen immer noch ein altes System, um Geld zu tauschen. Wir empfehlen Ihnen, TransferWise zu verwenden, das normalerweise viel billiger ist.

I started work on the Swift Programming Language in July of I implemented much of the basic language structure, with only a few people knowing of its existence.

A few other amazing people started contributing in earnest late in , and it became a major focus for the Apple Developer Tools group in July [ Retrieved September 25, Retrieved May 2, Apple Inc.

Retrieved August 3, Ars Technica. Retrieved June 6, The Next Web. Retrieved June 2, The Verge. Retrieved December 5, CIO Journal.

The Wall Street Journal Blogs. December 3, Swift Forums. Retrieved November 19, Swift Evolution. Retrieved November 20, June 2, Lay summary.

Retrieved September 10, October 22, Retrieved January 23, April 8, Retrieved April 8, Swift Blog. Retrieved March 13, Retrieved October 26, Retrieved March 1, Retrieved March 30, Retrieved February 25, Retrieved November 9, Apple Developer.

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Comparison Timeline History.

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