javascript - How do I double every other element in an array? -

i need output 2 arrays @ end of program.

the first array user inputs. second array should copy elements of first , replace every other element double. user saves "1, 2, 3, 4, 5" first array. second array should have: "1, 4, 3, 8, 5".

here have far.

head tags

function todouble(modarray) {    var modified = new array();    for(var = 1; < modarray.length; i+=2)    {       modified.push(modarray[i] * 2);     } return modified; } 

---

body tags

var origarray = new array(); var modarray = new array(); while() //ignore while loop part; working fine {     origarray = parseint(prompt("enter number: "));     document.write(origarray); //output 1    modarray.push(origarray); } var modified = todouble(modarray);  document.write(modified); //output 2 

i'm receiving doubled numbers , not entire array. example, if enter "1, 2, 3, 4, 5", "4, 8" output.

how can fix this? thank in advance!

do this:-

function todouble(modarray) {     (var = 1; < modarray.length; i+=2) {         modarray[i] *= 2;     }     return modarray; }