There are six basic types of data types in Swift programming.
- Character
- String
- Integer
- Float
- Double
- Boolean
Character
The character data type is used to represent a single-character string. We use the Character keyword to create character-type variables. For example
String
The string data type is used to represent textual data. We use the String keyword to create string-type variables.
String Interpolation
It allows injecting an expression directly into a string literal. This can be done with all types of values, including strings, integers, floating point numbers and more.
The syntax is a backslash followed by parentheses wrapping the value: \\(value). Any valid expression may appear in the parentheses, including function calls.
let number = 5
let interpolatedNumber = “\\(number)” // string is “5”
let fortyTwo = “\\(6 * 7)” // string is “42”
Concatenate strings
Concatenate strings with the + operator to produce a new string:
let name = “John”
let surname = “Appleseed”
let fullName = name + ” ” + surname // fullName is “John Appleseed”
Reversing Strings
let aString = “This is a test string.”
let reversedCharacters = aString.characters.reversed()
let reversedString = String(reversedCharacters)
Integer
Integer refers to a category of data types representing whole numbers. It’s a protocol that defines common behavior for integer types. Swift provides several built-in integer types, such as Int, Int8, Int16, Int32, Int64, UInt, UInt8, UInt16, UInt32, and UInt64
var integerNumber: Int = 10
var unsignedIntegerNumber: UInt = 20