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Strings in Swift are a collection of characters and are represented by the String type. The content of a String can be accessed in more than one way, even as a collection of Character values. Strings can also be used to insert constants, literals, variables and expressions into lengthier strings and this process is referred to as String interpolation.
When it was first introduced, Apple\'s Swift Programming Language was portrayed as an alternative to the Objective-C language. It was even described as \"Objective-C without the C. Swift has climbed the popularity rankings in no time and is used to develop applications for iOS, watchOS, tvOS and macOS. This general-purpose and multi-paradigm programming language is designed to work with Apple\'s Cocoa and Cocoa Touch frameworks. Swift uses the runtime library of Objective-C, thereby making it easier for code written in Objective-C, C++ and Swift to run within the same program.
Functions in Swift programming language are defined using the \'func\' keyword. These functions can have parameters with or without the return type. They are also used to return integers, strings, and float data type values as return types.
The process of recovering from error conditions in a program is called Error Handling. The Swift Programming Language offers four ways in which errors can be handled. You can handle an error using a do-catch statement, spread the error from a function to the code that calls that function, declare that the error will not occur, and handle the error as an optional value.
There are three primary collection types in Swift Programming Language i.e. arrays, sets, and dictionaries, for storing collections of values. While Arrays are ordered collections of values Dictionaries are unordered collections of key-values, and Sets are unordered collections of unique values.
Swift Programming Language offers a rich library of built-in and user-defined data types to programmers. Here are some of the popular data types available in Swift which are used for declaring variables: Int or UInt â This data type in Swift is used for whole numbers and the primary difference between the two is around the data range that they can have. Int32 and Int64 is used to define 32 and 64-bit signed integers whereas UInt32 and UInt64 are used to define 32 and 64-bit unsigned integer variables. Character â Characters are single-character string literals enclosed in double quotation marks, e.g. \"C\". String â These are a series of characters. For example, \"Hello, World!\" These can be accessed in different ways including a collection of Character values. Swift Programmers also use multiline string literals that span several lines and are a sequence of characters enclosed in three double quotation marks. Float â A Float in Swift Programming is used to represent a 32-bit floating-point number and any other number with smaller decimal points. Double â As the name suggests, Double is also a floating-point number, but it can hold double the number of digits. While Float has a precision of only 6 decimal digits, Double has a precision of 15 decimal digits. Bool ? This represents a Boolean value in Swift Programming which is either true or false. The Bool type in Swift Programming includes the C Bool and the Objective-C Bool type. It ensures that the properties, functions and methods taken from Objective-C and C have consistent type interfaces. Optional ? This represents a variable that can hold either a value or no value. There is a \"value that equals Y, or there is \"no value at all. An Optional is similar to using NIL with pointers in Objective-C, but they work for any type, not just classes. You can represent a data type as Optional by appending a \'?\' to the Type. Tuples â Tuples are used to group multiple values in single compound value and a tuple type is a comma-separated list of zero or more types. Tuples are considered as a min version of a struct and are always enclosed in parentheses. The values that rest inside a Tuple need not be of the same type and they are used for storing temporary values only. These come in handy when there is need to return multiple values from a function.
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