How can I default objects?

I want to do the equivalent of...

//Nonsensical开发者_如何学JAVA
config.items=[Ext.create('Foo.register.AccountTypeForm',{config:arguments.hidden=true})];

//works ofc, but it looks untidy
arguments.hidden=true;
config.items=[Ext.create('Foo.register.AccountTypeForm',{config:arguments})];

Could you do this?

config.items=[Ext.create('Foo.register.AccountTypeForm',
 {config:{hidden:true}})];

Or do you need reference the arguments object again later?