string concatenation or adding dom

JavaScript performance comparison

Test case created by JulienW

Preparation code

<div id='container'>
</div>
<script src="//ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
 
<script>
  Benchmark.prototype.setup = function() {
    var arr = [],
        urlbase = "http://www.somegallery.fr/image/",
        $container = $("#container");
    
    for (var i = 0, l = 100; i < l; i++) {
       arr.push(urlbase + i);
    }
  };

  Benchmark.prototype.teardown = function() {
    $container.empty();
  };
</script>

Preparation code output

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Testing in unknown unknown
Test Ops/sec
append on dom
 
var $ul = $("<ul>");
$container.append($ul);

    $.each(arr, function(count, item) {
        var newImg = '<li><img src="'+item+'"></li>';
        $ul.append(newImg);
    });
 pending…
string concatenation
 
var tmp = ''; 
$.each(arr, function(count, item) {
    tmp += '<li><img src="'+item+'"></li>';
});
$container.append(tmp);
 pending…
append on unattached dom with string concatenation
 
var $ul = $("<ul>");

    $.each(arr, function(count, item) {
        var newImg = '<li><img src="'+item+'"></li>';
        $ul.append(newImg);
    });

$container.append($ul);
 
 pending…
USE THIS: append on unattached dom without string concatenation
 
var $ul = $("<ul>");

    $.each(arr, function(count, item) {
        var $img = $('<img>').attr('src', item);
        var $li = $("<li>").append($img);
        $ul.append($li);
    });

$container.append($ul);
 
 pending…

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