[рони]

gsdev99,

<script>
let people = [
    {
        id: 1,
        firstName: 'Alexey',
    },
    {
        id: 2,
        firstName: 'Slava'
    },
    {
        id: 3,
        firstName: 'Vlad'
    },
    {
        id: 4,
        firstName: 'Andrey',
    },
    {
        id: 5,
        firstName: 'Mikhail'
    },
    {
        id: 6,
        firstName: 'Stepan'
    }
]
let arr = [4, 5, 2];
let result = people.filter(p => arr.includes(p.id));
document.write(JSON.stringify(result, null, 4))
  </script>