for (  i=0; i<arr.length; i++ ) {

    console.log(arr[i])

}

console.log("=============================================")

var arr1 = arr.slice();

for ( var i in arr1.reverse() ) {

    console.log(arr1[i])

}

console.log("=============================================")

var k = 0;

while( arr[k] ) {

   console.log( arr[k++] )

}

console.log("=============================================")

var arr2 = arr.slice().reverse();

var j = 0;

do {

  console.log(arr2[j++]);

} while (j < arr2.length);