Preparation code

<script>
var arr = new Array(1000 + 1).join('0').split('');

var foo = {
    "bar":{
        "method":{
            "add":function(n) {
                return ++n;
            }
        }
    }
};
</script>

Test runner

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for(var i in arr) {
    arr[i] = foo.bar.method.add(arr[i]);
}

for(var i in arr) {
    if(arr.hasOwnProperty) {
        arr[i] = foo.bar.method.add(arr[i]);
    }
}

for(i in arr) {
    arr[i] = foo.bar.method.add(arr[i]);
}

arr.forEach(function(e, i){
    arr[i] = foo.bar.method.add(arr[i]);
});

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