Сергей delphinpro

computed: {
  fullData() {
    return this.posts.map(post => ({
      post,
      user: this.users.find(user => user.id === post.userId) ?? {},
    }));
  },
},

<div v-for="n in fullData">
  <div>{{ n.post.title }}</div>
  <div>{{ n.user.name }}</div>
  <div>{{ n.post.body }}</div>
</div>

const result = [];
for (const n of numbers) {
  if (!objects.some(m => m.number === n)) {
    result.push(n);
  }
}

const result = numbers.filter(function(n) {
  return !this.has(n);
}, new Set(objects.map(n => n.number)));

const result = (function get(exclude, i, n = numbers[--i]) {
  return i >= 0
    ? get(exclude, i).concat(~exclude.indexOf(n) ? [] : n)
    : [];
})(objects.map(n => n.number), numbers.length);

const result = Object.values(objects.reduce(
  (acc, n) => (delete acc[n.number], acc),
  numbers.reduce((acc, n) => (acc[n] = n, acc), {})
));

const result = Array.from(objects.reduce(
  (acc, n) => (acc.delete(n.number), acc),
  new Map(numbers.map(n => [ n, n ]))
).values());

try {
	$this->startAnyMethod();
} catch (\Throwable $e) {
	$this->savelog($e);
}

Псевдокласс :first-child применяет стилевое оформление к первому дочернему элементу своего родителя.