Run results for: string-hashcode3

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/81.0.4044.138 Safari/537.36

Browser: Chrome 81

Operating system: Windows

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
hashCode1	552478.7 Ops/sec
hashCode2	12984620.0 Ops/sec
hashCode3	12713390.0 Ops/sec
hashCode4	4373712.0 Ops/sec

Script Preparation code:

function hashCode1(str){
  var hash = 0;
  if (str.length == 0) return hash;
  for (i = 0; i < str.length; i++) {
    char = str.charCodeAt(i);
    hash = ((hash<<5)-hash)+char;
    hash = hash & hash; // Convert to 32bit integer
  }
  return hash;
}

function hashCode2(str) {
  var hash = 0, i, chr;
  if (str.length === 0) return hash;
  for (i = 0; i < str.length; i++) {
    chr   = str.charCodeAt(i);
    hash  = ((hash << 5) - hash) + chr;
    hash |= 0; // Convert to 32bit integer
  }
  return hash;
};

function hashCode3(str) {
  var hash = 5381,
      i    = str.length;

  while(i) {
    hash = (hash * 33) ^ str.charCodeAt(--i);
  }
  return hash >>> 0;
}

function hashCode4(str) {
  var hash = 0, i = 0, length = str.length;

  for (; i < length; i++) {
    hash += str.charCodeAt(i) * (31**(length - i - 1));
    hash |= 0;
  }
  return hash;
}

Tests:

hashCode1
hashCode1('qwerty')
hashCode2
hashCode2('qwerty')
hashCode3
hashCode3('qwerty')
hashCode4
hashCode4('qwerty')