To print all the possible combinations of the words in a string

#!/usr/bin/env node

function swap(w, i, j) {
  var tmp = w[i];
  w[i] = w[j];
  w[j] = tmp;
}

function permute(w, i, n) {
  var j;

  if (i == n) {
    console.log(w.join(' '));
  } else {
    for (j = i; j < n; ++j) {
      swap(w, i, j);
      permute(w, i + 1, n);
      swap(w, i, j);
    }
  }
}

var s = "This is String",
    w = s.split(' ');

permute(w, 0, w.length);