forEach Bersarang

let herbivora = new Array('kambing', 'sapi', 'kuda');
let karnivora = new Array('harimau', 'serigala', 'anjing');
let omnivora = new Array('ayam', 'monyet', 'beruang');
let binatang = new Array(herbivora, karnivora, omnivora);
 
  binatang.forEach(function(jenis, i)
  {
      jenis.forEach(function(nama, index, i)
      {
          console.log('Indeks ke- ['+i+']['+index+'] ada binatang '+nama);
      });
  });