Swift - Swift Programming Language

Syntax Overview

1var x = 10 or let x = 10

1func functionName(parameters) -> returnType { }

1class ClassName { }

1// Single line or /* Multi-line */

Code Examples and Tutorials

Learning Swift programming requires hands-on practice with real code examples. Below, you'll find comprehensive code samples that demonstrate fundamental concepts, common programming patterns, and practical implementations. Each example is carefully explained to help you understand not just what the code does, but why it's written that way and how you can adapt it for your own projects.

1print("Hello, World!")

1var age: Int = 25
2let price: Double = 19.99
3var name: String = "John"
4let isActive: Bool = true

1func add(a: Int, b: Int) -> Int {
2    return a + b
3}
4
5let result = add(a: 5, b: 3)
6print("Sum: \(result)")

1class Person {
2    var name: String
3    var age: Int
4    
5    init(name: String, age: Int) {
6        self.name = name
7        self.age = age
8    }
9    
10    func display() {
11        print("\(name) is \(age) years old")
12    }
13}
14
15let person = Person(name: "John", age: 25)
16person.display()

1// For-in loop
2for i in 0..<10 {
3    print(i)
4}
5
6// For-in with array
7let numbers = [1, 2, 3, 4, 5]
8for num in numbers {
9    print(num)
10}

1let age = 18
2
3if age >= 18 {
4    print("Adult")
5} else {
6    print("Minor")
7}

Essential Swift Commands and Features

Understanding the essential commands and functions in Swift is crucial for effective programming. This section provides detailed explanations of the most important commands, functions, and language features you'll use regularly when developing applications with Swift. Each command is explained with its purpose, syntax, and practical usage examples to help you master the language quickly.

1print("Hello")

1var x = 10; let y = 20

1func myFunc() { }

1class MyClass { }

1import UIKit

1guard condition else { return }

Learning Swift Programming

Common Use Cases

Swift is widely used across various industries and application domains. Understanding where and how Swift is typically used helps you make informed decisions about when to choose this language for your projects. Below are the most common use cases where Swift excels, along with examples of real-world applications built with this powerful programming language.

Best Practices and Coding Standards

Following best practices is essential for writing professional, maintainable Swift code. These guidelines have been developed by the programming community over years of experience and help ensure your code is readable, efficient, and follows industry standards. Adopting these practices early in your Swift learning journey will make you a better developer and help you write code that others can easily understand and maintain.