non-vanilla getElementById

JavaScript performance comparison

Revision 33 of this test case created by AjiTae

Info

Compare the speed of non-vanilla getElementById :)

Preparation code

<p id="foo">Foo</p>
<p id="bar">Bar</p>
<p id="baz">Baz</p>
<script>
Benchmark.prototype.setup = function() {
    var idSelectorRegexp = /^#[a-zA-Z]+[a-zA-Z0-9_\-]*$/;
   
    var withSlice = function(query){
      // pure ID selector?
      if (idSelectorRegexp.test(query))
        return document.getElementById(query.slice(1));
      else
        return document.querySelector(query);
    };
    var withSubstring = function(query){
      // pure ID selector?
      if (idSelectorRegexp.test(query))
        return document.getElementById(query.substring(1));
      else
        return document.querySelector(query);
    };
    var withSubstr = function(query){
      // pure ID selector?
      if (idSelectorRegexp.test(query))
        return document.getElementById(query.substr(1));
      else
        return document.querySelector(query);
    };
   
    var withBind = function(query){};
    withBind.id = document.getElementById.bind(document);
   
    var withReturn = function(query){};
    withReturn.id = function(id){ return document.getElementById(id)}
};
</script>

Preparation code output

Foo

Bar

Baz

Test runner

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Testing in unknown unknown
Test Ops/sec
getElementById
var bar = document.getElementById("bar");
var baz = document.getElementById("baz");
var foo = document.getElementById("foo");
pending…
querySelector
var bar = document.querySelector("#bar");
var baz = document.querySelector("#baz");
var foo = document.querySelector("#foo");
pending…
withSlice
var bar = withSlice("#bar");
var baz = withSlice("#baz");
var foo = withSlice("#foo");
pending…
withSubstring
var bar = withSubstring("#bar");
var baz = withSubstring("#baz");
var foo = withSubstring("#foo");
pending…
withSubstr
var bar = withSubstr("#bar");
var baz = withSubstr("#baz");
var foo = withSubstr("#foo");
pending…
return getElementById
var bar = withReturn.id("bar");
var baz = withReturn.id("baz");
var foo = withReturn.id("foo");
pending…
bind getElementById
var bar = withBind.id("bar");
var baz = withBind.id("baz");
var foo = withBind.id("foo");
pending…

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Revisions

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