Functional Javascript Quick Sort

functional_quick_sort.js

const filter = (list, predicate) => list.filter(predicate)

const filterLessThan = (list, value) => filter(list, item => item < value)

const filterGreaterOrEqualThan = (list, value) => filter(list, item => item >= value)

const quickSort = ([head, ...tail]) => head === undefined ? [] : [
  ...quickSort(filterLessThan(tail, head)),
  head,
  ...quickSort(filterGreaterOrEqualThan(tail, head))
]

const randomInteger = (min, max) => parseInt(min + (Math.random() * (max - min + 1)))

const randomIntegerList = (size, min, max) => [...new Array(size)].map(randomInteger.bind(null, min, max))

console.log(quickSort(randomIntegerList (100, 1, 1000)))