Swift Strings

Introduction to Strings in Swift

Strings are a fundamental data type in Swift used to represent text. A string is a sequence of characters, such as words, sentences, or even empty text. Swift provides powerful tools for creating, modifying, and manipulating strings, making them highly versatile.

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Creating Strings

Strings can be created using string literals enclosed in double quotes:

File: main.swift

let greeting: String = "Hello, Swift!"
let emptyString = "" // An empty string

print(greeting)
print("Is the string empty? \(emptyString.isEmpty)")

Output:

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String Interpolation

String interpolation allows you to include variables or expressions inside a string:

File: main.swift

let name = "Arjun"
let age = 25

let message = "My name is \(name) and I am \(age) years old."
print(message)

Explanation:

• The variables name and age are embedded into the string using \().

Output:

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String Concatenation

Strings can be combined using the + operator:

File: main.swift

let part1 = "Hello, "
let part2 = "World!"
let combined = part1 + part2

print(combined)

Output:

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String Properties and Methods

Strings in Swift have several useful properties and methods:

File: main.swift

let text = "Swift Programming"

print("Length of the string: \(text.count)")
print("Does it start with 'Swift'? \(text.hasPrefix("Swift"))")
print("Does it end with 'Programming'? \(text.hasSuffix("Programming"))")

Output:

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Iterating Over Characters

You can iterate over the characters in a string:

File: main.swift

let word = "Swift"

for char in word {
    print(char)
}

Output:

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Multi-line Strings

Swift supports multi-line strings using triple double quotes:

File: main.swift

let poem = """
Roses are red,
Violets are blue,
Swift is awesome,
And so are you!
"""

print(poem)

Output: