micro selector libraries (v4)

Revision 4 of this benchmark created on

Preparation HTML

<div id="iddiv">
  <div class="inside"></div>
  <div class="inside"></div>
</div>
<div class="classdiv"></div>
<script>
// James Doyle - original regex version
window.$ = function(selector) {
  var matches = {
    '#': 'getElementById',
    '.': 'getElementsByClassName',
    '@': 'getElementsByName',
    '=': 'getElementsByTagName',
    '*': 'querySelectorAll'
  };
  var regex = /[=#@.*]/.exec(selector)[0];
  return (document[matches[regex]](selector.split(regex)[1]));
};
// Michał Wachowski
window.$$ = function(s) {
    return document[{
        '#': 'getElementById',
        '.': 'getElementsByClassName',
        '@': 'getElementsByName',
        '=': 'getElementsByTagName'}[s[0]]
        || 'querySelectorAll'](s.slice(1))
};
// Tomasz Żełudziewicz
window.$$$ = function(s) {
    try {return document[{
        '#': 'getElementById',
        '.': 'getElementsByClassName',
        '@': 'getElementsByName',
        '=': 'getElementsByTagName',
        '?': 'querySelectorAll'
    }[s[0]]](s.slice(1));}catch(e){}
};
window.$$$$ = function(s) {
    try {return document[[s[0]]](s.slice(1));}catch(e){}
};

// Mark Knol
var _matches = {
	'#': document.getElementById,
	'.': document.getElementsByClassName,
	'@': document.getElementsByName,
	'=': document.getElementsByTagName,
	'*': document.querySelectorAll
}

window.$$$$$ = function(selector) {
  return (_matches[selector[0]].call(document, selector.slice(1)));
};

window.$$$$$$ = function(selector) {
  var key = selector[0];
  switch(key)
  {
	case '#': return document.getElementById(selector.slice(1)); break;
	case '.': return document.getElementsByClassName(selector.slice(1)); break;
	case '@': return document.getElementsByName(selector.slice(1)); break;
	case '=': return document.getElementsByTagName(selector.slice(1)); break;
	case '*': return document.querySelectorAll(selector.slice(1)); break;
  }
  return null;
};
</script>

Test runner

Ready to run.

Testing in
TestOps/sec
Original regex
$('#iddiv');
$('.classdiv');
$('?div .inside');
ready
return string[0] in document
$$('#iddiv');
$$('.classdiv');
$$('?div .inside');
ready
try/catch return
$$$('#iddiv');
$$$('.classdiv');
$$$('?div .inside');
ready
document gets
document.getElementById('iddiv');
document.getElementsByClassName('classdiv');
document.getElementsByTagName('div')[0].getElementsByClassName('inside');
ready
querySelector
document.querySelectorAll('#iddiv');
document.querySelectorAll('.classdiv');
document.querySelectorAll('div .inside');
ready
matches as separate object, reference to functions
$$$$$('#iddiv');
$$$$$('.classdiv');
$$$$$('?div .inside');
ready
switch statement
$$$$$$('#iddiv');
$$$$$$('.classdiv');
$$$$$$('?div .inside');
ready

Revisions

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