Quicksort

quicksort.js

function quicksort(arr) {
  if (arr.length < 2) return arr;
  
  const pivot = arr[0];
  const less = arr.filter(item => item < pivot && item !== pivot);
  const greater = arr.filter(item => item > pivot && item !== pivot);
  
  return [...quicksort(less), pivot, ...quicksort(greater)]; 
}

console.log(quicksort([10, 5, 2, 3])); // [2, 3, 5, 10]