Nice easy way of iterating over radiogroup

iterate-over-radio-group.js

const radioGroup = e.target.closest('*[role=radiogroup]')
const isDown  = e.keyCode == 40
const isLeft  = e.keyCode == 37
const isUp  = e.keyCode == 38
const isRight  = e.keyCode == 39

if (radioGroup) {
  const children = radioGroup.querySelectorAll('[role=radio]')
  const index = [...children].indexOf(e.target)
  const nextIndex = index + 1 == children.length ? 0 : index + 1
  const previousIndex = index - 1 == -1 ? children.length - 1 : index - 1

  if (isRight || isDown) children[nextIndex].focus()
  if (isLeft || isUp) children[previousIndex].focus()
}