querySelectorAll vs getElementById

JavaScript performance comparison

Revision 45 of this test case created by zibi

Preparation code

<span data-l10n-id="foo0">gix</span>
<span data-l10n-id="foo1">gix</span>
<span data-l10n-id="foo2">gix</span>
<span data-l10n-id="foo3">gix</span>
<span data-l10n-id="foo4">gix</span>
<span data-l10n-id="foo5">gix</span>
<span data-l10n-id="foo6">gix</span>
<span data-l10n-id="foo7">gix</span>
<span data-l10n-id="foo8">gix</span>
<span data-l10n-id="foo9">gix</span>
<p id="foo">bar</p>

Preparation code output

gix gix gix gix gix gix gix gix gix gix

bar

Test runner

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Testing in unknown unknown
Test Ops/sec
querySelectorAll
var nodes = document.querySelectorAll('[data-l10n-id]');
for (var i = 0; i < nodes.length; i++) {
  var node = nodes[i];
}
pending…
querySelector
for (var i = 0; i < 10; i++) {
  var node = document.querySelector('[data-l10n-id=foo'+i+']');
}
pending…

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