Java Script loop

 To iterate over array elements......

1.

var array=[1,3,2,5,8,9];

for(var index=0; index < array.length; ++index){

    console.log(array[index]);

}

2. 

var i=0;
array = [10,50,20,80,30];
while(i<array.length)
{
   console.log(array[i]);
    ++i;
}

3.

index=0;
array=[80,81,82,83,84,85,89];
(7) [80, 81, 82, 83, 84, 85, 89]

square =x => Math.pow(x,2);

x => Math.pow(x,2)

squares = array.map(square);

(7) [6400, 6561, 6724, 6889, 7056, 7225, 7921]

console.log(array);

VM1547:1 (7) [80, 81, 82, 83, 84, 85, 89]

console.log(squares);