mapFilter.js

const records = [
  { title: "The Clash", artist: "The Clash", type: "LP", lengthSec: 2220, released: "1977"},
  { title: "Rocket to Russia", artist: "Ramones", type: "LP", lengthSec: 1906, released: "1977"},
  ...etc
];

records.filter(record => record.lengthSec > (60 * 60))
       .map(record => ({
         ...record,
         ['display']: `${record.artist} - ${record.title} (${record.released})`
       }));