Checking if key exists in a JavaScript Array? (v18)

Revision 18 of this benchmark created by Test on

Preparation HTML

<script>
var long_text = "the the the the the Ladies others the six desire age. Bred am soon park past read by lain. As excuse eldest no moment. An delight beloved up garrets am cottage private. The far attachment discovered celebrated decisively surrounded for and. Sir new the particular frequently \
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var words = long_text.split(/\s+/);
array = [];
var i , length = words.length; 
for (i =0; i <  length; i++) {
    array[words[i]]= (array[words[i]] || 0) + 1;
}
</script>

Test runner

Ready to run.

Testing in
TestOps/sec
Using in
var result = "Impression" in array;
ready
Using indexOf
var result = array.indexOf("Impression");
ready
Array as Map
var result = array["Impression"];
ready
Array as Object
var result = array.Impression;
ready

Revisions

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