What are the features of Swift?

Vaibhav Kothia May 26, 2023 0 Comments

1. Type Safety: Swift is a type safe language, which means that every variable must be declared with a specific type. For example, if you create a variable called “name” and set it to a string value, it will always remain a string.

2. Speed: Swift is significantly faster than Objective-C, and it can run up to 2.6x faster than Objective-C.

3. Memory Management: Swift uses Automatic Reference Counting (ARC) to manage memory usage. This means that developers don’t have to manually manage memory usage, which can be a tedious and error-prone task.

4. Closures: Closures are a powerful feature of Swift, which allow developers to create self-contained blocks of code that can be passed around and used in various ways. For example, a closure can be used to create a custom sorting algorithm for an array.

5. Optionals: Optionals are a powerful feature of Swift that allow developers to handle the absence of a value. For example, if you are trying to access an element in an array, you can use an optional to determine whether or not the element exists.

What do you know about Swift programming language?

Vaibhav Kothia May 26, 2023 0 Comments

Swift is a powerful and intuitive programming language for macOS, iOS, watchOS, tvOS, and beyond. It is designed to give developers the freedom and capabilities they need to create a variety of apps. Swift is easy to learn and use, and provides a safe and fast way to develop powerful apps.

An example of a program written in Swift is a simple calculator app. Here is a code snippet for a basic calculator:

import UIKit

class ViewController: UIViewController {

@IBOutlet weak var resultLabel: UILabel!

var numberOnScreen:Double = 0

@IBAction func numbers(_ sender: UIButton) {

if let number = sender.currentTitle {

if number == “C” {

resultLabel.text = “0”

numberOnScreen = 0

} else {

if resultLabel.text == “0” {

resultLabel.text = number

} else {

resultLabel.text = resultLabel.text! + number

}

numberOnScreen = Double(resultLabel.text!)!

}

}

}

}

This code snippet creates a basic calculator app that allows the user to input numbers and perform basic calculations.