/**
 * Returns a hash code for a string, the hash value of the empty string is zero.
 * (Compatible with Java's String.hashCode())
 * @param {string} string a string
 * @return {number} a hash code value for the given string.
 */
function stringToHashCode(string: string) {
  let hash = 0;

  for (let i = 0; i < string.length; i++) {
    // the "| 0" part forces hash to be a 32-bit number, optimizing for speed in JS engines
    hash = ((Math.imul ? Math.imul(31, hash) : (hash << 5) - hash) + string.charCodeAt(i)) | 0;
  }

  return hash;
}

export default stringToHashCode;