Run results for: Count string occurrence

http://stackoverflow.com/questions/4009756/how-to-count-string-occurrence-in-string http://stackoverflow.com/questions/881085/count-the-number-of-occurences-of-a-character-in-a-string-in-javascript

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.5 Safari/605.1.15

Browser: Safari 17

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Use split

6.6M/s

Use indexOf

6.0M/s

Use regex

4.8M/s

View exact numbers

Test name	Executions per second
✓ Use split	6,576,571 Ops/sec
Use indexOf	6,032,443 Ops/sec
Use regex	4,761,854 Ops/sec

Script Preparation code:

function regex(s, re) {
  var r = s.match(re);
  if (r) return r.length;
  return 0;
}

function split(s, oc) {
  return s.split(oc).length - 1;
}

function indexOf(s, oc) {
  var i = 0, count = 0;
  while ((i = s.indexOf(oc, i)) >= 0) {
    count++;
    i++;
  }
  return count;
}

Tests:

Use regex
window.result = regex("This is a pen", /is/g);
Use split
window.result = split("This is a pen", "is");
Use indexOf
window.result = indexOf("This is a pen", "is");