Preparation code

<script type="text/javascript">

function fasterSplit(str,len){
  var ret=[],strlen=str.length,off=0
  do {
    ret.push(str.substr(off,len)); 
 off+=len
  } while (off<strlen)
  return ret
}

splitRegex = function(str, len) {
  var regex = new RegExp('[\\s\\S]{1,' + len + '}', 'g');
  return str.match(regex);
}

var splitRegexCached = (function(){
  var regexCache = {};
  return( function(str, len) {
    var regex = regexCache[len] || (regexCache[len] = new RegExp('[\\s\\S]{1,' + len + '}', 'g'));
    return str.match(regex);
  });
})();

function splitSlice(str, len) {
  var ret = [ ];
  for (var offset = 0, strLen = str.length; offset < strLen; offset += len) {
    ret.push(str.slice(offset, len + offset));
  }
  return ret;
}

function splitSubstr(str, len) {
  var ret = [ ];
  for (var offset = 0, strLen = str.length; offset < strLen; offset += len) {
    ret.push(str.substr(offset, len));
  }
  return ret;
}

var simpleWhileSubstr = function (string, length) {
    var array = [];
    
    while (string.length > 0) {
        array.push(string.slice(0, length));
        string = string.substr(length);
    }
    
    return array;
};

var tinyString  = (new Array(39)).join('abcdefghijklmnopqrstuvwxyz');
var shortString  = (new Array(385)).join('abcdefghijklmnopqrstuvwxyz');
var mediumString  = (new Array(3856)).join('abcdefghijklmnopqrstuvwxyz');
var longString  = (new Array(38462)).join('abcdefghijklmnopqrstuvwxyz');
var spanArray = [6666, 2, 3339, 5, 1620, 13, 847, 22, 521, 46,  254, 88, 145];
var spanLength = spanArray.length;
var i = 0, span;
</script>
<script>
  Benchmark.prototype.teardown = function() {
    i = 0;
  };
</script>

Test runner

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span = spanArray[i++ % spanLength];
fasterSplit(tinyString, span);
fasterSplit(shortString, span);
fasterSplit(mediumString, span);
fasterSplit(longString, span);

span = spanArray[i++ % spanLength];
splitRegexCached(tinyString, span);
splitRegexCached(shortString, span);
splitRegexCached(mediumString, span);
splitRegexCached(longString, span);
 

span = spanArray[i++ % spanLength];
splitSubstr(tinyString, span);
splitSubstr(shortString, span);
splitSubstr(mediumString, span);
splitSubstr(longString, span);

span = spanArray[i++ % spanLength];
splitSlice(tinyString, span);
splitSlice(shortString, span);
splitSlice(mediumString, span);
splitSlice(longString, span);

span = spanArray[i++ % spanLength];
simpleWhileSubstr(tinyString, span);
simpleWhileSubstr(shortString, span);
simpleWhileSubstr(mediumString, span);
simpleWhileSubstr(longString, span);

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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 James Brumond on 25th May 2012
• Revision 2: published by Jon-Carlos Rivera on 26th May 2012
• Revision 3: published by gildas on 26th May 2012
• Revision 5: published on 27th May 2012 and last updated on 28th May 2012
• Revision 6: published on 28th May 2012
• Revision 7: published on 29th May 2012
• Revision 8: published by supsup on 29th May 2012
• Revision 9: published by Tgr on 6th June 2012
• Revision 10: published by Naomi Kyoto on 15th January 2013

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