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let urlString = "https://myiosapp.com"

let result = try! validateUrl(urlString: urlString)

// the result is always true or valid url

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let urlString = ""

// converting value to nil, if it error
let result = try? validateUrl(urlString: urlString)

// handle optional value
if result != nil {
    print("the url is valid")
} else {
    print("the url is not valid")

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// Step 3 use do try catch
let urlString = ""
do {
    let result = try validateUrl(urlString: urlString)
    
    // Step 5 continue the process if it success
    print("is url valid? \(result)")
}
catch {
    // Step 4 show error to users

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import UIKit


// Step 2 create enum for custom error
enum CustomError: Error {
    case invalidUrl
    case emptyUrl
    case other
}

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//
//  ViewController.swift
//  GettingStartedUITableView
//
//  Created by Sigit on 13/11/20.
//

import UIKit

class ViewController: UIViewController {

sigidhanafi

//
//  ViewController.swift
//  GettingStartedUITableView
//
//  Created by Sigit on 13/11/20.
//

import UIKit

class ViewController: UIViewController {

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class ViewController: UIViewController {
    
    // create property tableview
    private let tableView: UITableView = {
        let tableView = UITableView()
        tableView.backgroundColor = .white
        tableView.translatesAutoresizingMaskIntoConstraints = false
        
        return tableView
    }()

sigidhanafi

import React, { Component } from 'react';

class App extends Component {
  state = {
    number: 0,
    update: true
  }

  componentWillMount () {
    console.log('Component WILL MOUNT')

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import React from 'react'
import ReactDOM from 'react-dom'
import App from './components/app'

ReactDOM.render(<App />, document.querySelector('.container'))

// this will remove component from DOM after 10000 ms
setTimeout(() => {
  ReactDOM.unmountComponentAtNode(document.querySelector('.container'))
}, 10000)