const sortedCompanies = companies.sort(function(c1, c2) { if(c1.start > c2.start) { return 1; } else { return -1; } }); const sortedCompanies = companies.sort((a, b) => (a.start > b.start ? 1 : -1)); // Sort ages const sortAges = ages.sort((a, b) => a - b);