for(var i=0;i<arr.length;i++){ console.log('one '+arr[i].toString()); } for(var i = arr.length - 1; i > 0; i--){ console.log('two '+arr[i]); }

var j = 0; while(j < arr.length){ console.log('three '+arr[j]); j++; }

var k = arr.length - 1; while(k >= 0){ console.log('four '+arr[k]); k--; }