Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var text = "Lorem ipsum dolor sit amet, consectetur adipiscing elit. Duis lacus tortor, dignissim ut eleifend ut, dignissim in dolor. In sit amet eros vulputate nulla pulvinar volutpat vitae eu libero. Fusce ligula metus, dictum vitae scelerisque ac, fermentum ac dolor. Donec nec sapien dui. Proin vel lorem quam, vel sollicitudin ipsum. Morbi at dapibus leo. Morbi eget eleifend neque. Pellentesque non dolor turpis. In diam orci, sagittis vel facilisis ipsum eu, tempus et tellus. Class aptent taciti sociosqu ad ipsum litora torquent per conubia nostra, per inceptos himenaeos. Phasellus at pretium metus. Quisque accumsan lobortis scelerisque. Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Vestibulum ante ipsum primis in faucibus orci luctus et ultrices posuere cubilia Curae; Nullam facilisis adipiscing ipsum tempus. Vestibulum quis dictum dui. Donec ligula dui, feugiat eget rutrum vitae, dapibus sit amet quam. Praesent ullamcorper condimentum est at ultricies. Ut eu nulla mag.";
    
    var subText = "ipsum";
  };
</script>

Test runner

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Java applet disabled.

function occurrences(string, substring) {

  var n = 0;
  var c = 0;
  var l = substring.length;

  for (var i = 0, len = string.length; i < len; i++) {

    if (string.charAt(i) == substring.charAt(c)) {
      c++;
    } else {
      c = 0;
    }

    if (c == l) {
      c = 0;
      n++;
    }
  }
  return n;
}

n = occurrences(text, subText);

function occurrences(string, substring) {

  var n = 0;
  var l = substring.length - 1;
  var c = l;

  var len=string.length-1;
  for (var i = len; i >= 0; i--) {

    if (string.charAt(i) == substring.charAt(c)) {
      c--;
    } else {
      c = l;
    }

    if (c < 0) {
      c = l;
      n++;
    }
  }
  return n;
}

n = occurrences(text, subText);

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Revisions

You can edit these tests or add even more tests to this page by appending /edit to the URL. Here’s a list of current revisions for this page:

• Revision 1: published by Victor on 6th June 2012
• Revision 2: published on 7th June 2012
• Revision 3: published on 7th June 2012
• Revision 4: published by Victor on 7th June 2012
• Revision 5: published on 7th June 2012

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