How to print field names and values in a struct?

General Usage
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2

You want getfield(foo, fname)

For more info:

help?> getfield
search: getfield

  getfield(value, name::Symbol)

  Extract a named field from a value of composite type. The syntax a.b calls getfield(a, :b).

  julia> a = 1//2
  1//2
  
  julia> getfield(a, :num)
  1
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