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Tests for fastest way to determine if a string is in an array

Preparation code

<script>
function asObject(a)
{
    var o = {};
    for (var i = 0; i < a.length; i++)
    {
        o[a[i]] = '';
    }

    return o;
}
</script>
<script src="http://documentcloud.github.com/underscore/underscore-min.js"></script>
<script>
  Benchmark.prototype.setup = function() {
    var testArray = ['a', 'b', 'c', 'd', 'e'];
    var testObject = { 'a': '', 'b': '', 'c': '', 'd': '', 'e': ''};
    var testFor = 'f';
  };
</script>

Preparation code output

Test runner

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switch (testFor)
{
    case 'a':
    case 'b':
    case 'c':
    case 'd':
    case 'e':
    case 'f':
        return true;
    default:
        return false;
}

for (var i in testArray) {
    if (testArray[i] == testFor) {
        return false;
    }
}

return true;

return (testFor in testObject);

return (testFor in asObject(testArray));

for (var i =0; i < testArray.length; i++) {
    if (testArray[i] == testFor) {
        return false;
    }
}

return true;

return typeof(testObject[testFor]) !== 'undefined'

return testObject[testFor] != null

return (_.indexOf(testArray, testFor) != -1)

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Revisions

You can edit these tests or add even more tests to this page by appending /edit to the URL. Here’s a list of current revisions for this page:

• Revision 1: published by Dom on 3rd February 2012
• Revision 2: published on 3rd February 2012

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