Swift Syntax

Basic Structure

Swift code is organized into statements, which are typically written one per line. Unlike languages such as C, Java, or JavaScript, Swift does not require a semicolon at the end of each statement — the end of a line is enough to signal the end of a statement.

let city = "Chennai"
let country = "India"
print(city)
print(country)

Semicolons Are Optional (For Multiple Statements)

You can still use a semicolon if you want to put multiple statements on a single line. This is allowed but not commonly used, since Swift's style favors one statement per line for readability.

let a = 5; let b = 10; print(a + b) // 15

Case Sensitivity and Naming

Swift is case-sensitive, so `myValue` and `MyValue` are treated as two different identifiers. Variable and constant names typically use camelCase (starting with a lowercase letter), while type names such as classes and structs use PascalCase (starting with an uppercase letter).

• Identifiers can contain letters, digits, and underscores, but cannot start with a digit
• Swift keywords like `let`, `var`, and `func` are reserved and cannot be used as names
• Blocks of code are grouped using curly braces `{ }`
• Whitespace and indentation improve readability but are not syntactically required
• Comments are ignored entirely by the compiler

func greet(name: String) {
    let message = "Hi, \(name)!"
    print(message)
}

greet(name: "Aditi")