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AWS Certification notes

Those are my personal notes on AWS Solution Architect certification preparation. Hope you find them usefull.

To pass AWS certification, you should have:

• Sound knowledge about most of the AWS services ( EC2, VPC, RDS, Cloudfront, S3, Route53 etc,)
• Hands on experience with AWS services.

eiwaithein

// error handling middleware
const env = process.env.NODE_ENV || 'development'
function errorHandler(err, req, res, next) {
    res.statusCode = 500;
    switch (env) {
        case 'development':
            console.error('Error');
            console.error(err);
            res.setHeader('Content-Type', 'application/json');
            res.end(JSON.stringify(err));

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// send (Post) notification
NotificationCenter.default.post(name: Notification.Name("NotificationIdentifier"), object: nil)

// receive (get) notification
NotificationCenter.default.addObserver(self, selector: #selector(YourClassName.methodOfReceivedNotification(notification:)), name: Notification.Name("NotificationIdentifier"), object: nil)

// method handler for notification 
func methodOfReceivedNotification(notification: Notification){
        //Take Action on Notification
 }

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extension ViewController : UITableViewDelegate {
    
    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        tableView.deselectRow(at: indexPath, animated: false)
    }
    
    func tableView(_ tableView: UITableView, willSelectRowAt indexPath: IndexPath) -> IndexPath? {
        if searchResults.count == 0 {
            return nil
        } else {

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//1. import and delegate
import UserNotifications
class AppDelegate: UIResponder, UIApplicationDelegate, UNUserNotificationCenterDelegate {
  
  //2. asking for permission
    let center = UNUserNotificationCenter.current()
    center.requestAuthorization(options: [.alert, .sound]) {
      granted,error in
      if granted {
        print("we have permission")

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// 1. to call segue go to next screen.
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    if segue.identifier == "ShowChecklist" {
      let controller = segue.destination as! ChecklistViewController
      controller.checklist = sender as! Checklist // passing variable for next view via sender.

    } else if segue.identifier == "AddChecklist" {
      let navigationController = segue.destination as! UINavigationController

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//1. store in UserDefaults
let defaults = UserDefaults.standard
defaults.set(25, forKey: "age")
defaults.set(true, forKey: "isUsedTouchID")
defaults.setValue("Ei Wai", forKey: "Name")

//2. retrieve from UserDefaults
let age = defaults.integer(forKey: "age")
let useTouchID = defaults.bool(forKey: "isUsedTouchID")
let name = defaults.string(forKey: "Name")

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var items : [ChecklistItem] = []

// for saving.    
    func documentsDirectory() -> URL {
        let paths = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)
        return paths[0]
    }
    
    
    func dataFilePath() -> URL {

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    func loadWebViewContent(){
        if let url =  Bundle.main.url(forResource: "fileName", withExtension: "html") {
            if let htmlData = try? Data(contentsOf: url) {
                let baseURL = URL(fileURLWithPath: Bundle.main.bundlePath)
                webView.load(htmlData, mimeType: "text/html", textEncodingName: "UTF-8", baseURL: baseURL)
            }
            
            
        }

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self.view.backgroundColor = [UIColor redColor];
    CABasicAnimation *theAnimation;
    theAnimation=[CABasicAnimation animationWithKeyPath:@"transform.scale"];
    theAnimation.duration=0.7;
    theAnimation.repeatCount=HUGE_VALF;
    theAnimation.autoreverses=YES;
    theAnimation.fromValue=[NSNumber numberWithFloat:1.0];
    theAnimation.toValue=[NSNumber numberWithFloat:0.7];
    theAnimation.timingFunction=[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseIn];
    [self.view.layer addAnimation:theAnimation forKey:@"animateOpacity"];