AppleCEO

class SmartPhone {
  let inch: Double
  let isFolded: Bool = false

  init(inch: Double) {
    self.inch = inch
  }
  
  func call(to: String) {
    print("calling to \(to)")

AppleCEO

class SmartPhone {
  let inch: Double

  func call(to: String) {
    print("calling to \(to)")
  }
  func showYoutube() {
    print("Watching Youtube")
  }
}

AppleCEO

protocol Coffee {
  func drink()
}

struct Americano: Coffee {
  func drink() {
    print("아메리카노를 마십니다.")
  }
}

AppleCEO

struct Programmer {
  private let coffee: Coffee
	
  init(coffee: Coffee) {
    self.coffee = coffee
  }
	
  func startProgramming() {
    self.coffee.drink()
    //...

AppleCEO

struct Programmer {
  private let coffee = Coffee()
		
  func startProgramming() {
    self.coffee.drink()
    //...
  }
}

AppleCEO

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
  let cell = tableView.dequeueReusableCell(withIdentifier: "SearchTableViewCell", for: indexPath) as! SearchTableViewCell
  if indexPath.row == 0 {
      cell.backgroundColor = .orange
  }
  return cell
}

AppleCEO

//DECODE JSON WEB TOKEN (JWT) IN IOS (OBJECTIVE-C)
//http://popdevelop.com/2013/12/decode-json-web-token-jwt-in-ios-objective-c/

NSString *jwt = @"eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJmb28iOiJiYXIifQ.bVhBeMrW5g33Vi4FLSLn7aqcmAiupmmw-AY17YxCYLI";

NSArray *segments = [jwt componentsSeparatedByString:@"."];
NSString *base64String = [segments objectAtIndex: 1];
NSLog(@"%@", base64String);
// => "eyJmb28iOiJiYXIifQ"

AppleCEO

import React from "react";
import "./styles.css";

export default function App() {
  return <Contact />
}

class ContactInfo extends React.Component {
  render() {
    return (

AppleCEO

import React from "react";
import "./styles.css";

export default function App() {
  return <Counter />;
}

class Counter extends React.Component {
  constructor(props) {
    super(props);

AppleCEO

class Codelab extends React.Component {
  render() {
    let text = "Hi I am codelab";
    let stylegg = {
      backgroundColor: 'aqua'
    };
    
    return (
      <div style={stylegg}>{text}</div>
    );