Run results for: Count char occurrence in string

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 (Linux; Android 7.0; LG-M250) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/107.0.0.0 Mobile Safari/537.36

Browser: Chrome Mobile 107

Operating system: Android 7.0

Device Platform: Mobile

Date tested: 2 years ago

Test name	Executions per second
regex	48958.5 Ops/sec
split	182116.2 Ops/sec
indexOf1	91808.8 Ops/sec
indexOf2	89320.8 Ops/sec
singleChar	38821.2 Ops/sec

Script Preparation code:

function regex (s, c) {
  return (s.match(new RegExp(c, "g")) || []).length;
}

function split (s, c) {
  return s.split(c).length - 1;
}

function indexOf1 (s, c) {
  var i = 0, count = 0;
  while ((i = s.indexOf(c, i)) >= 0) {
    count++;
    i++;
  }
  return count;
}

function indexOf2 (s, c) {
  for (let i = -2, count = -1; i != -1; count++, i = s.indexOf(c, i + 1));
}

function singleChar (s, c) {
  for(let i = 0, count = 0, l = s.length; i < l; count += +(c === s[i++]));
}

var s = "Maecenas sed lacus erat. Sed fringilla dui ac mollis condimentum. Suspendisse bibendum nulla eros, ut lobortis orci posuere quis. Nunc fringilla ut metus ultrices dictum. Nunc elementum feugiat leo. Ut fermentum, enim vel vehicula posuere, metus eros imperdiet risus, at elementum mauris urna et quam. Ut vehicula, velit at placerat ornare, nulla nisi finibus sapien, non elementum tellus purus in ex. Donec pharetra elit in rhoncus placerat. Sed volutpat eget justo ut dapibus. Mauris consectetur turpis ac euismod aliquam. Sed pellentesque pretium nunc, nec rhoncus leo euismod ut. Lorem ipsum dolor sit amet, consectetur adipiscing elit. Curabitur gravida sed urna quis tempus. Nam aliquet tortor convallis libero mollis luctus.";
var c = "a";

Tests:

regex
window.result = regex(s, c);
split
window.result = split(s, c);
indexOf1
window.result = indexOf1(s, c);
indexOf2
window.result = indexOf2(s, c);
singleChar
window.result = singleChar(s, c);