Convert laravel object to js array

i am new in laravel. how to convert laravel object into js array. my coce is below..

$customer = new Customer();             
        $result = $customer->where('client_state','like', '%'.$statename.'%')->get(array('client_state'));

        echo $result;

result is...

[{"client_state":"Gujarat1"},{"client_state":"Gujarat"}]

but i need like this..

["Gujarat1","Gujarat"]

how it is possible?

via Chebli Mohamed