I don't understand the var hatred in c#. Why type a type name twice? I can understand a function result needing to be explicitly typed but why do this?

StringBuilder stringBuilder = new StringBuilder();

That is horrendously redundant. Var is handy shorthand and should be used!!

To provide an alternative view, in e.g. Haskell the redundancy would be solved the other way round:

    (stringBuilder :: StringBuilder) <- construct

(Assuming that there was a type class that had construct as a method and StringBuilder was an instance of that class.)

when declare and init an obj with constructor, yes it's annoying to type the type twice and I def. use `var`

But what if you're doing something like

    var x = myOtherObjectName.y;

readability is destroyed in this case.