{"id":120277,"date":"2023-11-09T18:00:28","date_gmt":"2023-11-09T12:30:28","guid":{"rendered":"https:\/\/data-flair.training\/blogs\/?p=120277"},"modified":"2023-11-09T20:46:20","modified_gmt":"2023-11-09T15:16:20","slug":"swift-strings","status":"publish","type":"post","link":"https:\/\/data-flair.training\/blogs\/swift-strings\/","title":{"rendered":"Swift Strings"},"content":{"rendered":"

Strings are a fundamental data type in Swift. Swift offers a useful set of features for utilizing strings. It provides methods for string manipulation, formatting and searching. In this article, we\u2019ll discuss strings and concepts related to them with the help of relevant examples.<\/p>\n

Swift String Creation<\/h2>\n

We can create a string by either using a string literal or defining a string instance.<\/p>\n

var stringExample: String = \"DataFlair\"\r\nprint(stringExample)<\/pre>\n
Output:<\/strong><\/p>\n
DataFlair<\/p>\n
The example below shows how to create a string instance.<\/strong><\/p>\n
var stringInstance = String()<\/pre>\n
Empty String<\/h3>\n
We can create a string by either using an empty string literal or defining a string instance.<\/p>\n
var stringExample: String = \"\"<\/pre>\n
The example below shows how to create a string instance.<\/strong><\/p>\n
var stringInstance = String()<\/pre>\n
String Interpolation<\/h3>\n
We can also embed variables directly within a string using string interpolation. It becomes easy to format and display variable values alongside text.<\/p>\n
var name: String = \"DataFlair\"\r\nprint( \"Name: \\(name)\")<\/pre>\n
Output:<\/strong><\/p>\n
Name:<\/strong> DataFlair<\/p>\n
String Length<\/h3>\n
Swift provides a property count to measure the length of the string<\/p>\n
var stringExample = \"DataFlair\"\r\nprint(stringExample.count)<\/pre>\n
Output:<\/strong><\/p>\n
9<\/p>\n
String Comparison<\/h3>\n
To compare strings, we use the \u2018==\u2019 operator. When the strings are the same, the condition is true, otherwise false.<\/p>\n
var stringExample1 = \"DataFlair\"\r\nvar stringExample2 = \"DataFlair\"\r\nvar stringExample3 = \"DataFlair 1\"\r\n\r\nprint(stringExample1 == stringExample2)\r\nprint(stringExample2 == stringExample3)\r\nprint(stringExample2 != stringExample3)<\/pre>\n
Output:<\/strong><\/p>\n
true
\nfalse
\ntrue<\/p>\n
String Iteration in Swift<\/h3>\n
We use for-in loop to iterate through each character in a string.<\/p>\n
var stringExample1 = \"DataFlair\"\r\n\r\nfor char in stringExample1{\r\n    print(char, terminator: \".\")\r\n}<\/pre>\n
Output:<\/strong><\/p>\n
D.a.t.a.F.l.a.i.r.<\/p>\n
Swift String Concatenation<\/h3>\n
We can concatenate two strings in two ways. One is using the append method. The second uses the + operator.<\/p>\n
The following examples show the usage of concatenation methods.<\/strong><\/p>\n
var string1 = \"Data\"\r\nvar string2 = \"Flair\"\r\nvar stringExample = string1 + string2\r\nprint(\"Using + operator:\", stringExample)\r\nstring1.append(string2)\r\nprint(\"Using append function:\", string1)<\/pre>\n
Output:<\/strong><\/p>\n
Using + operator:<\/strong> DataFlair
\nUsing append function:<\/strong> DataFlair<\/p>\n
String Methods in Swift<\/h3>\n\n\n\n\n\n\n\n\n\n\n
Method<\/b><\/td>\nDescription<\/b><\/td>\n<\/tr>\n
isEmpty<\/span><\/td>\nCheck if the string is empty<\/span><\/td>\n<\/tr>\n
capitalized<\/span><\/td>\nCapitalize the first letter of every word in the string<\/span><\/td>\n<\/tr>\n
hasPrefix(prefix)<\/span><\/td>\nCheck if particular characters are at the start of the string<\/span><\/td>\n<\/tr>\n
hasSuffix(suffix)<\/span><\/td>\nChecks if particular characters are at the end of the string<\/span><\/td>\n<\/tr>\n
lowercased()<\/span><\/td>\nConverts the string into lowercase<\/span><\/td>\n<\/tr>\n
uppercased()<\/span><\/td>\nConverts the string into uppercase<\/span><\/td>\n<\/tr>\n
reversed()<\/span><\/td>\nReverses the string<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
Escape Sequences in Swift<\/h3>\n
Strings cannot have unescaped characters like a backslash (\\) or double quotes (\u201c). These special characters can be written in a string literal using escape sequences.<\/p>\n
The table below represents the escape sequence for the character, along with its description.<\/strong><\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Escape Sequence Character<\/b><\/td>\nEscape Sequence<\/b><\/td>\n<\/tr>\n
Null Character<\/span><\/td>\n\\0<\/span><\/td>\n<\/tr>\n
Back Slash<\/span><\/td>\n\\\\<\/span><\/td>\n<\/tr>\n
Backspace\u00a0<\/span><\/td>\n\\b<\/span><\/td>\n<\/tr>\n
Form Feed<\/span><\/td>\n\\f<\/span><\/td>\n<\/tr>\n
Newline<\/span><\/td>\n\\n<\/span><\/td>\n<\/tr>\n
Carriage Return<\/span><\/td>\n\\r<\/span><\/td>\n<\/tr>\n
Horizontal Tab<\/span><\/td>\n\\t<\/span><\/td>\n<\/tr>\n
Vertical Tab<\/span><\/td>\n\\v<\/span><\/td>\n<\/tr>\n
Single Quote<\/span><\/td>\n\\\u2018<\/span><\/td>\n<\/tr>\n
Double Quote<\/span><\/td>\n\\\u201c<\/span><\/td>\n<\/tr>\n
Octal number<\/span><\/td>\n\\000<\/span><\/td>\n<\/tr>\n
Hexadecimal number<\/span><\/td>\n\\xhh<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
Unicode Strings in Swift<\/h3>\n
We can iterate through the UTF-8 and UTF-16 representation of the strings. We use the utf8 and utf16 properties.<\/p>\n
var example = \"DataFlair\"\r\n\r\nprint(\"UTF-16\")\r\nfor ch in example.utf16{\r\n    print(ch)\r\n}\r\nprint()\r\nprint(\"UTF-8\")\r\nfor ch in example.utf8{\r\n    print(ch)\r\n}<\/pre>\n
Output:<\/strong><\/p>\n
UTF-16
\n68
\n97
\n116
\n97
\n70
\n108
\n97
\n105
\n114<\/p>\n
UTF-8
\n68
\n97
\n116
\n97
\n70
\n108
\n97
\n105
\n114<\/p>\n
Conclusion<\/h3>\n
Strings are an essential data type in any language. They represent textual data. In this article, we\u2019ve covered swift strings and concepts related to them. We have also seen how we can compare strings and use them in programming. We have discussed different functions and operations provided by Swift.<\/p>\n","protected":false},"excerpt":{"rendered":"
Strings are a fundamental data type in Swift. Swift offers a useful set of features for utilizing strings. It provides methods for string manipulation, formatting and searching. 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