Combine Javascript Objects?

Question

Are these just objects, not arrays? How can I combine them into a new variable?

var common_options = {
    'city': 'Baltimore',
    'state': 'MD'
}
var other_options = {
   'name': 'bob',
   'job': 'cook'
}

I tried this with no luck

var new_options = $.merge(common_options, new_options)

and

var new_options = common_options.concat(new_options)