Java’s String.hashCode()

hashstr.js

const hashstr = s => {
  let hash = 0;
  if (s.length == 0) return hash;
  for (let i = 0; i < s.length; i++) {
    let char = s.charCodeAt(i);
    hash = ((hash<<5)-hash)+char;
    hash = hash & hash; // Convert to 32bit integer
  }
  return hash;
}