Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var someData = [0,1,2,3,4,5,6,7,8,9];
    
    function equalsTen (data) {
        var dataLen = data.length;
        for (var i=0; i<dataLen; i++) {
            for (var j=0; j<dataLen; j++) {
                if (j != i && (data[i]+data[j]) == 10) {
                    document.write(data[i]+" and "+data[j]+" are a match <br>");
                    return true;
                }
            }
        }
        document.write("no matches<br>");
        return false;
    }
    
    function equalsTen2 (data) {
        var dataLen = data.length;
        for (var i=0; i<dataLen; i++) {
            var diff = 10-data[i];
            var result = data.indexOf(diff);
            if (result > -1 && result != i) {
                document.write(data[i]+" and "+data[result]+" are a match <br>");
                return true;
            }
        }
        document.write("no matches<br>");
        return false;
    }
  };
</script>

Test runner

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document.write(equalsTen(someData));

document.write(equalsTen2(someData));

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