JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.4/lodash.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/platform/1.3.4/platform.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/benchmark/2.1.4/benchmark.min.js"></script>

JavaScript

function permute_SiGanteng(input) {
  var permArr = [],
    usedChars = [];

  function permute(input) {
    var i, ch;
    for (i = 0; i < input.length; i++) {
      ch = input.splice(i, 1)[0];
      usedChars.push(ch);
      if (input.length == 0) {
        permArr.push(usedChars.slice());
      }
      permute(input);
      input.splice(i, 0, ch);
      usedChars.pop();
    }
    return permArr
  }
  return permute(input);
}

function permute_delimited(inputArr) {
  var results = [];

  function permute(arr, memo) {
    var cur, memo = memo || [];
    for (var i = 0; i < arr.length; i++) {
      cur = arr.splice(i, 1);
      if (arr.length === 0) {
        results.push(memo.concat(cur));
      }
      permute(arr.slice(), memo.concat(cur));
      arr.splice(i, 0, cur[0]);
    }
    return results;
  }
  return permute(inputArr);
}

function permute_monkey(inputArray) {
  return inputArray.reduce(function permute(res, item, key, arr) {
    return res.concat(arr.length > 1 && arr.slice(0, key).concat(arr.slice(key + 1)).reduce(permute, []).map(function(perm) {
      return [item].concat(perm);
    }) || item);
  }, []);
}

function permute_Oriol(input) {
  var permArr = [],
    usedChars = [];
  return (function main() {
    for (var i = 0; i < input.length; i++) {
      var ch = input.splice(i, 1)[0];
      usedChars.push(ch);
      if (input.length == 0) {
        permArr.push(usedChars.slice());
      }
      main();
      input.splice(i, 0, ch);
      usedChars.pop();
    }
    return permArr;
  })();
}

function permute_MarkusT(input) {
  function permutate(array, callback) {
      function p(array, index, callback) {
          function swap(a, i1, i2) {
              var t = a[i1];
              a[i1] = a[i2];
              a[i2] = t;
          }
          if (index == array.length - 1) {
              callback(array);
              return 1;
          } else {
              var count = p(array, index + 1, callback);
              for (var i = index + 1; i...