Quick & simple non-cryptographic 32bit hash function for non-security applications like generating colors from a string or slug. Based on the djb2a algorithm but + UTF16 rotation, + reversal, + XORing a random number.

djb2e-hash.js

// Usage:
// djb2eHash( 'Hello World1' ); # => 1171219298
// djb2eHash( 'Hello World2' ); # =>  449666786
// djb2eHash( 'Hello World3' ); # =>  201925602
// djb2eHash( 'Hello World4' ); # => 3033001186
function djb2eHash(string, randomNumber = 0xcde7) {
  // UTF16-rotate a character.
  function rotU16(charCode) {
    return 0x10000 - charCode;
  }
  const gnirts = string.split('').reverse().join('');
  let hash = 5381; // Important magic number.
  let limit = 0xffffffff; // 32-bit mask.

  for (let i = 0; i < string.length; i++) {
    // Normal string |> djb2a .
    // hash = hash * 33 XOR charCode (bound into 32bits).
    hash = (((hash << 5) + hash) ^ string.charCodeAt(i)) & limit;
    // Normal string |> reverse |> djb2a .
    hash = (((hash << 5) + hash) ^ gnirts.charCodeAt(i)) & limit;
    // Normal string |> rotate |> djb2a .
    hash = (((hash << 5) + hash) ^ rotU16(string.charCodeAt(i))) & limit;
    // Normal string |> reverse |> rotate |> djb2a .
    hash = (((hash << 5) + hash) ^ rotU16(gnirts.charCodeAt(i))) & limit;
  }

  // XOR with a random number to improve the results on small strings
  // and return a 32-bit number.
  return (hash ^ randomNumber) >>> 0;
}