Sort an array of strings backwards in js...I don't know why

sort-strings-backwards.js

// an array of strings mangled with this function will sort
// backwards. You can then mangle them again after the sorting
// to get your original words. of course, you could just do sort().reverse(), but
// I was curious. So, completely useless.
const maxUnicodeValue = 0x10FFFF;

function invertString(input) {
  let result = '';
  for(let c of input) {
    const oldCode = c.codePointAt(0);
    const newCode = -(oldCode - maxUnicodeValue);
    result += String.fromCodePoint(newCode);
  };
  return result;
}

// function dump(name, val) {
//   console.log(`${name}: ${val}\t${val.toString(16)}`);
// }

let raw = [ "We", "walk", "the", "streets", "at", "night"];

console.log('\nBefore sorting.');
console.dir(raw);

raw.sort();
console.log('\nSorted normally.');
console.dir(raw);

let mangled = raw.map(x => invertString(x));
mangled.sort()
// unmangle them after sorting
let mangledUnmangled = mangled.map(x => invertString(x));

console.log('\nSorted while mangled');
console.dir(mangledUnmangled);

// or just
console.dir(raw.sort().reverse());