const hero = {
     firstName: 'Florence',
-    lastName: 'Nightingale'
+    lastName: 'Nightingale',
+    inventorOf: ['coxcomb graph', 'modern nursing']
}
// good - git diff with trailing comma
const hero = {
     lastName: 'Nightingale',
}
// bad
const hero = {
  firstName: 'Dana',
  lastName: 'Scully'
};
const heroes = [
  'Superman'
// good
const hero = {
  firstName: 'Dana',
  lastName: 'Scully',
};
const heroes = [
  'Batman',
];