Transform an integer value into its string representation:

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Another useful element in Swift is the closure, which denotes a self-contained block of code that can be assigned to a variable, passed as an argument to some function, and called to execute it. A parallel can be drawn between this concept and the code block in Smalltalk, which can also be manipulated and called by different language constructs. As a simple example of a lock declaration and its use, consider the following statements.

The complete lock syntax states the number and types of the parameters, the type of the return value, and the statements that comprise it. The lock consists of a single integer parameter and a single statement that albania phone number data creates a String instance from the parameter and returns it. It is possible to simplify the lock syntax by taking advantage of type inference, as shown in the following statements:


In this case, because there is only one statement, the compiler infers that the String instance created from the integer parameter is the return value of the lock. Such an inference allows the compiler to also determine that the type of the return value is String, making it unnecessary to declare it explicitly.

Methods
Listing 3 shows the declaration of the Airline class that complements the classes declared in Listings 1a and 1b. The class declares the corporateInformation property to store general company information such as its corporate name, street address, URL, and stock information. Because the data stored in this property does not vary between instances of Airline, the variable is declared as a type property using the static modifier and is explicitly initialized when the class is declared. The displayCorporateInformation() method is a type method that displays the information stored by the corporateInformation property and is invoked by sending a message directly to the Airline class, as shown in Listing 3.