How do I concatenate strings in Swift?

In Swift, you can use the "+" operator and join function to join the strings. You can concatenate multiple strings using this operator. In this article, we will see some examples of how to concatenate the strings.

Here are several examples of using the operator and in-built functions.

Algorithm

• Step 1 − Create the strings

• Step 2 − Combine both strings using the given function

• Step 3 − Print the input and output string on the console

Example 1

In this example, we will see an example of adding two strings with a space.

import Foundation
let str1 = "Hello"
let str2 = "world"
let concatenatedString = str1 + " " + str2
print("String 1: \(str1)")
print("String 2: \(str2)")
print("Concatenated String: \(concatenatedString)")

Output

String 1: Hello
String 2: world
Concatenated String: Hello world

Example 2

In this example, we concatenate three separate strings using the + operator and a space character as a separator. The resulting string contains all three strings joined together with spaces.

import Foundation
let str1 = "The quick brown"
let str2 = "fox jumps over"
let str3 = "the lazy dog."
let concatenatedString = str1 + " " + str2 + " " + str3
print("String 1: \(str1)")
print("String 2: \(str2)")
print("String 3: \(str3)")
print("Concatenated String: \(concatenatedString)")

Output

String 1: The quick brown
String 2: fox jumps over
String 3: the lazy dog.
Concatenated String: The quick brown fox jumps over the lazy dog.

Example 3

In this example, we use string interpolation to concatenate an integer value (age) with a string value. We include the integer value inside a set of parentheses preceded by a backslash \ to interpolate it into the string.

import Foundation
let age = 25
let message = "I am \(age) years old"
print("Concatenated String: \(message)")

Output

Concatenated String: I am 25 years old

Example 4

In this example, we use the += operator to concatenate multiple long strings into a single variable. This approach can be useful when dealing with large strings or when you need to build up a string incrementally over time.

import Foundation
var longString = "Lorem ipsum dolor sit amet, consectetur adipiscing elit. "
longString += "Vestibulum faucibus blandit metus vel aliquam. "
longString += "Suspendisse sit amet metus eget odio varius gravida."
print("Concatenated String: \(longString)")

Output

Concatenated String: Lorem ipsum dolor sit amet, consectetur adipiscing elit. Vestibulum faucibus blandit metus vel aliquam. Suspendisse sit amet metus eget odio varius gravida.

Example 5

In this example, we create an array of strings (words) and then use the joined(separator:) method to concatenate all the strings in the array into a single string. We specify a space character as the separator between each string.

import Foundation
let words = ["The", "quick", "brown", "fox", "jumps", "over", "the", "lazy", "dog."]
let concatenatedString = words.joined(separator: " ")
print("Concatenated String: \(concatenatedString)")

Output

Concatenated String: The quick brown fox jumps over the lazy dog.

Example 6

In this example, we use the joined(separator:) function to concatenate three strings into a single string, just like in the previous example. However, instead of calling the method on an array directly, we pass an array of strings as an argument to the function.

import Foundation
let str1 = "The quick brown"
let str2 = "fox jumps over"
let str3 = "the lazy dog."
let concatenatedString = [str1, str2, str3].joined(separator: " ")
print("Concatenated String: \(concatenatedString)")

Output

Concatenated String: The quick brown fox jumps over the lazy dog.

Conclusion

Finally, depending on your goals and use case, Swift supports a variety of methods for concatenating strings.

The + operator, string interpolation, and the += operator are some of the most often used ways for concatenating strings in Swift.

Swift also has methods for attaching individual characters or strings to existing strings, such as the join() method, string concatenation routines, and the appending() method.

You may generate complicated strings from separate components or dynamic strings based on the values of variables and expressions by utilizing these various techniques and functions.