Preparation code

<ul></ul><script src="//ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
 
<script>
  Benchmark.prototype.setup = function() {
    var $ul = $( "ul" );
    $ul.html("<li class='current'><li><li></li><li></li>");
  };
</script>

Preparation code output

Test runner

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$ul.children().removeClass( "current" ).eq(2).addClass( "current" );

$ul.children().filter( ".current" ).removeClass( "current" ).end().eq(2).addClass( "current" );

$ul.children().eq(2).addClass("current").siblings().removeClass( "current" );

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