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Swift Programming Language Tutorial

Swift is a modern, fast, and easy-to-learn programming language developed by Apple. It is mainly used to build applications for Apple platforms like iOS, iPadOS, macOS, watchOS, and tvOS. Swift is beginner-friendly and also powerful enough for professional developers.

What is Swift Programming Language?

Swift is a general-purpose programming language designed by Apple to replace Objective-C. It is safe, secure, and very fast. Swift code is easy to read and write, which makes it suitable for beginners and experienced developers.

History of Swift

Swift was first introduced by Apple in the year 2014 during the Worldwide Developers Conference (WWDC). The main aim of Swift was to make app development easier, faster, and safer.

Who Developed Swift?

Swift was developed by Apple Inc. The main contributor to Swift is Chris Lattner along with the Apple developer team.

Applications of Swift

• iOS mobile applications
• iPad applications
• macOS desktop applications
• watchOS and tvOS apps
• Server-side development
• Game development

Features of Swift

• Simple and clean syntax
• High performance
• Safe programming with less errors
• Automatic memory management (ARC)
• Open-source language
• Modern programming features

Advantages of Using Swift

• Easy to learn for beginners
• Fast execution speed
• Safe and secure
• Strong community support
• Best language for Apple platforms

Basics of Swift Programming

Swift programs are written using simple English-like syntax. Semicolons are not mandatory. Swift supports variables, constants, data types, operators, and functions.

Hello World Program in Swift

print("Hello, World!")

Hello, World!

Swift Comments

Comments are used to explain code and improve readability.

// This is a single-line comment

/*
 This is a
 multi-line comment
 */

Variables and Constants in Swift

Variables are declared using var and constants are declared using let.

var name = "Sudhir"
let age = 25

print(name)
print(age)

Sudhir
25

Conditional Statements in Swift

Conditional statements are used to make decisions in a program. Swift supports if, if-else, and switch statements.

if-else Example

let marks = 75

if marks >= 40 {
    print("Pass")
} else {
    print("Fail")
}

Pass

Loops in Swift

Loops are used to repeat a block of code. Swift mainly supports for-in and while loops.

for-in Loop Example

for i in 1...5 {
    print(i)
}

1
2
3
4
5

while Loop Example

var i = 1
while i <= 3 {
    print(i)
    i += 1
}

1
2
3

Functions in Swift

Functions are used to group code and reuse it whenever required.

func add(a: Int, b: Int) {
    print(a + b)
}

add(a: 10, b: 20)

30

Arrays in Swift

Arrays are used to store multiple values of the same type in a single variable.

var numbers = [1, 2, 3, 4, 5]
print(numbers)

[1, 2, 3, 4, 5]

Dictionaries in Swift

Dictionaries store data in key-value pairs.

var student = ["name": "Rahul", "age": "21"]
print(student["name"]!)

Rahul

Swift Optionals

Optionals are used when a variable may or may not have a value. They help to avoid runtime errors.

var city: String? = "Delhi"

if city != nil {
    print(city!)
}

Delhi

Swift Classes and Objects

Classes are used to create objects. They help in organizing code and data.

class Person {
    var name = "Amit"
    
    func showName() {
        print(name)
    }
}

let p = Person()
p.showName()

Amit

Swift Structures

Structures are similar to classes but are value types.

struct Car {
    var brand = "Swift"
}

let c = Car()
print(c.brand)

Swift

Swift Enums

Enums are used to define a group of related values.

enum Direction {
    case north, south, east, west
}

let move = Direction.north
print(move)

north

Error Handling in Swift

Swift provides built-in support for handling errors in a safe way.

enum FileError: Error {
    case fileNotFound
}

func readFile() throws {
    throw FileError.fileNotFound
}

do {
    try readFile()
} catch {
    print("Error occurred")
}

Error occurred

Swift Programming Language Summary

Swift is a powerful and modern programming language developed by Apple. It is simple, fast, and safe. Swift is mainly used for developing iOS and macOS applications and is a great choice for beginners as well as professional developers.

Why Learn Swift?

Swift is the future of Apple app development. It is easy to learn, highly demanded in the job market, and ideal for building high-quality mobile and desktop applications.

Swift Programs (Examples)

We have written many Swift programming language example programs to help you understand Swift concepts easily. These examples are explained in a simple way for better learning. To practice Swift programs topic-wise, you can check our Swift programs section, where examples are organized category-wise for beginners and learners.

Swift Programs