sort1d.js

const x = [
  'header-c',
  'value',
  'header-a',
  'value',
  'header-b',
  'value'
]

function sort1D (arr) {
  let i = arr.length
  while (i -= 2) {
    if (arr[i - 2] > arr[i]) {
      arr.push(...arr.splice(i - 2, 2))
    }
  }
  return arr
}

console.log(sort1D(x))