[julia-users] how to undefine variable in composite types

[Freddy Chua]

Suppose I have a Type

type Foo
  a
  b
end

f = Foo(1,2)
f.a = 1
f.b = 2

how do I test whether f.a is defined
I do this isdefined(f, 1) but isdefined(f, 'a') does not work

another question
how do i undefine f.a such that isdefined(f,1) now returns false