"+=" operator vs array concat

JavaScript performance comparison

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Preparation code

<div id="container"></div>

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Testing in unknown unknown
Test Ops/sec
"+=" operator
var html = '';
html += '<nav></nav>';
html += '<div id="content">';
for (var i; i < 100; i++) {
    html += '<h1>' + i + ',</h1>';
html += '</div><div id="footer"></div>';
document.getElementById('container').innerHTML = html;
array concat
var arr = [];
arr.push('<div id="content">')
for (var i; i < 10; i++) {
    arr.push('<h1>' + i + ',</h1>');
arr.push('</div><div id="footer"></div>');
document.getElementById('container').innerHTML = arr;

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