EJSohn

package main
import "fmt"

func main() {
  fmt.Println("hello world")
}

EJSohn

package main
import "fmt"

func main() {
  fmt.Println("hello world")
}

EJSohn

echo "Need root permission."
sudo echo "Done."
read -p "1. Enter username: " username
read -p "2. Enter comment: " comment
sudo adduser $username -c "$comment" --firstuid 10000 --ingroup developers --disabled-password --gecos ""
echo "User created!"
echo -e "$username\n$username" | sudo passwd $username >/dev/null 2>&1
sudo passwd -e $username >/dev/null 2>&1
echo "username : $username"
echo "initial password : $username"

EJSohn

# install ubuntu packages
apt-get install -y make build-essential libssl-dev zlib1g-dev libbz2-dev \
libreadline-dev libsqlite3-dev wget curl llvm libncurses5-dev libncursesw5-dev \
xz-utils tk-dev

touch ~/.bash_profile

# install pyenv
git clone https://github.com/pyenv/pyenv.git ~/.pyenv
echo 'export PYENV_ROOT="$HOME/.pyenv"' >> ~/.bash_profile

EJSohn

public enum Result<Value> {
    case Success(Value)
    case Failure(NSData?, ErrorType)
}

EJSohn

func evaluate(_ expression: ArithmeticExpression) -> Int {
    switch expression {
        case let .number(value):
            return value
        case let .addition(left, right):
            return evaluate(left) + evaluate(right)
        case let .multiplication(left, right):
            return evaluate(left) * evaluate(right)
    }
}

EJSohn

enum ArithmeticExpression {
    case number(Int)
    indirect case addition(ArithmeticExpression, ArithmeticExpression)
    indirect case multiplication(ArithmeticExpression, ArithmeticExpression)
}

EJSohn

// declare variables.
var today = WeatherCondition.sunny(24)
var yesterday = WeatherCondition.cloudy(Cloud.cirrus, 10)

switch today {
  case .sunny(let temperature):
    print("today's temperature is \(temperature).")
  
  case .rainy(let inchesPerHour):
    print("\(inchesPerHour) inches of rainwater.")

EJSohn

enum Cloud {
  case cirrus
  case cumulus
  case altocumulus
  case cumulonimbus
}

enum WeatherCondition {
  case sunny(temperature: Float)
  case rainy(inchesPerHour: Float)

EJSohn

// Enumeration of type Fruit.
enum Fruit: Int {
  case apple = 1000
  case banana = 500
  case grape = 2500
}

// declare variable.
let orderedFruit: Fruit = .apple