Simple Hash function in JavaScript

hash.js

/**
 * A simple hashing function based on FNV-1a (Fowler-Noll-Vo) algorithm
 * @param str the string to hash
 * @returns the hash of the string
 * @see https://en.wikipedia.org/wiki/Fowler%E2%80%93Noll%E2%80%93Vo_hash_function
 * Outputs a 128-bit hash (32 characters long)
 */
const hash = (str) => {
  const FNV_PRIME = 0x01000193;
  const h = [0x811c9dc5, 0x056892cd, 0x6b6b2d4f, 0x458e7388];
  str += 't%V7t6Bu0^sN5zrjAZF*%eAVd49H0DhL';

  for (let i = 0; i < str.length; i++) {
    for (let j = 0; j < h.length; j++) {
      if (j == 0) h[j] ^= str.charCodeAt(i);
      else h[j] ^= h[j - 1];
      h[j] *= FNV_PRIME;
    }
  }

  return h.map(v => (v >>> 0).toString(16).padStart(8, '0')).join('');
};