a function for quick sort algorithm using underscore naming convention for naming variables and functions

function qSort (arr) {
  if (arr.length < 2) return arr
  const result = []
  const left = []
  const right = []
  const pivot = arr[0]
  for (let i = 1, len = arr.length; i < len; i++) {
    if (arr[i] < pivot) left.push(arr[i])
    else right.push(arr[i])
  }
  return result.concat(qSort(left), pivot, qSort(right))
}