reduceFilter.js

// item is named record for easily knowing what
// we're operating on
records.reduce((acc, record) => {
  // Recored is not longer than 60 mins
  // return acc as is, doing nothing with record (filter)
  if (record.lengthSec > (60 * 60)) return acc;

  // Destructure acc into new array
  // Destructure record into new object and add display prop  
  return [
    ...acc,
    {
      ...record,
      ['display']: `${record.artist} - ${record.title} (${record.released})`
    }
  ]
}, []);