JavaScript: Conditionals & Functions

• Conditional (ternary) operator. In the function body, make sure to put return before the condition.

fruits = ['aa','bb','cc','dd'];
const fruit = fruits.map(fruit =>{
  return fruit === 'aa'? 'aaaaaa' : fruit;
});

console.log(fruit);   //output: [ 'aaaaaa', 'bb', 'cc', 'dd' ];

• A switch example

let shopItem = 'apple';
switch(shopItem){
  case 'apple':
    console.log('Apples are 10/lb.');
    break;
  case 'orange':
    console.log('Oranges are 11/lb.');
    break;
  case 'peach':
    console.log('Peaches are 12/lb.');
    break;
  default:
    console.log('Invalid Item');
    break;
}

---

• Codecademy project:Write JS functions to enable play rock scissors and paper.

const getUserChoice = userInput =>{
  if (userInput ==='rock' || userInput==='paper' || userInput ==='scissors'){
    return userInput;
  } else {
    console.log('error');
  }
}

const getComputerChoice = () => {
  const computerDice = Math.floor(Math.random()*3);
  switch (computerDice){
    case 0:
      return 'rock';
      break;
    case 1:
      return 'paper';
      break;
    default:
      return'scissors';
      break;
  }
}

const determineWinner =(userChoice,computerChoice)=>{
  if (userChoice === computerChoice){
    return 'tie'
  } else if(userChoice === 'rock' && computerChoice==='paper'){
    return 'computer won';  
  } else if (userChoice === 'paper' && computerChoice ==='scissors'){
    return 'computer won';   
  } else if (userChoice ==='scissors' && computerChoice === 'rock'){
    return 'computer won';
  } else {
    return 'user won';
  }

}

const playGame = (userChoice,computerChoice)=>{
   userChoice = getUserChoice('paper');
   computerChoice = getComputerChoice();
   console.log(`You threw: ${userChoice}`);
   console.log(`The computer threw: ${computerChoice}`);
   console.log(`The resule is: ${determineWinner(userChoice, computerChoice)} `);
}
playGame();

The output for this code: