RWILT #1 (js)

by doubledebug

HTML

<p id="p1">Test 1: </p>
<p id="p2">Test 2: </p>

JavaScript

function formatUsername(user) {
  return `${user.name}, ${user.age}`;
}

const user1 = { name: 'Dule', age: 25}
const user2 = { name: null }

document.getElementById('p1').textContent += formatUsername(user1); // ✔️
document.getElementById('p2').textContent += formatUsername(user2); // ❌ error at runtime