arrow-functions.jsx

const getFive = () => 5
const addFive = a => a + 5
const divide = (a, b) => a / b

// to jest to samo, co:
function getFive() {
  return 5
}
function addFive(a) {
  return a + 5
}
function divide(a, b) {
  return a / b
}

// w Reactcie:
function TeddyBearList({teddyBears}) {
  return (
    <ul>
      {teddyBears.map(teddyBear => (
        <li key={teddyBear.id}>
          <span>{teddyBear.name}</span>
        </li>
      ))}
    </ul>
  )
}