javascript odd and even separation in an array of numbers

Question

i wants to separate an array with two groups (odd and even) sequentially. but when i try this:

Answer 1

The way you do it is so complicated. You can simply achieve that with array.prototype.filter and array.prototype.concat:

var arr = [1, 2, 3, 4, 5, 6, 7, 8, 9];
arr = arr.filter(e => e%2).concat(arr.filter(e => e%2 === 0));
console.log(arr);