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extension FileManager {
    func documentDirectory() -> URL {
        return FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)[0]
    }
    
    class func libraryDirectory() -> URL {
        return try! FileManager.default.url(for: .libraryDirectory, in: .userDomainMask, appropriateFor: nil, create: false)
    }
    
}

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    // MARK: - Body
    var body: some View {
        Text("Tap here to check")
            .onTapGesture {
                let str = "Test Message"
                let url = self.getDocumentsDirectory().appendingPathComponent("message.txt")
                
                do {
                    try str.write(to: url, atomically: true, encoding: .utf8)
                    let input = try String(contentsOf: url)

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    func getDocumentsDirectory() -> URL {
        let paths = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)
        return paths[0]
    } //: get Documents directory func

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 let users = [
        User(firstName: "Arnold", lastName: "Igh"),
        User(firstName: "Ryan", lastName: "Fgc"),
        User(firstName: "None", lastName: "Abc")
             ].sorted() // after operator overloaded, we can use .sorted()

    // MARK: - Body
    var body: some View {
        
        List(users) { user in

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struct User: Identifiable, Comparable {
    static func < (lhs: User, rhs: User) -> Bool {
        lhs.lastName < rhs.lastName
    }
    
    let id = UUID()
    let firstName: String
    let lastName: String
}

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//
//  ImageSaver.swift
//  Instafilter
//
//  Created by Ryan J. W. Kim on 2021/10/29.
//

import UIKit

class ImageSaver: NSObject {

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// change it
@State var currentFilter: CIFilter = CIFilter.sepiaTone()

// change applyProcessing and add setFilter func

    func applyProcessing() {
        // adapting to each filter params to safely workaround with input param
        let inputKeys = currentFilter.inputKeys
        if inputKeys.contains(kCIInputIntensityKey) { currentFilter.setValue(filterIntensity, forKey: kCIInputIntensityKey) }
        if inputKeys.contains(kCIInputRadiusKey) { currentFilter.setValue(filterIntensity * 200, forKey: kCIInputRadiusKey) }

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struct MultipleActionSheet: View {
    // MARK: - Properties
    // alert for alert , actionSheet for actionSheet. They are similar in many functions
    @State private var showingActionSheet = false
    @State private var backgroundColor = Color.white
    
    // MARK: - Body
    var body: some View {
        Text("Touch here to change color")
            .frame(width: 300, height: 300)

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struct SwiftUIView: View {
    var body: some View {
        AsyncImage(url: URL(string: "https://stackoverflow.design/assets/img/logos/so/logo-stackoverflow.png")) { image in
            image.resizable()
                .scaledToFit()
        } placeholder: {
            ProgressView()
        }
        .frame(width: 200, height: 200)
    }

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import CoreImage
import CoreImage.CIFilterBuiltins
import SwiftUI

struct ContentView: View {
    // MARK: - Properties
    @State private var image: Image?
    @State private var filterIntensity = 0.5
    
    @State private var showingImagePicker = false