How to iterate through composite from parent to all children

I have a composite object that contains tree-like structure containing a parent and children. It looks like this:

• parent
  • id
  • name
  • children
    • children[0] -id -name -children -children[0] -id -name -children -id -name -children[0..i] -children[1,..i] -children[1] -id -name -children[0..i]

How to iterate through this structure?

Best