How to add a new field to Julia type?

Question

In Python, you can use setattrto add a new attribute to an object, such as the following code

class Foobar:
    def __init__(self):
        pass

foobar = Foobar()
setattr(foobar, 'foo', 123)

print(foobar.foo)

Output

123

I know Julia has setfield! but it does not allow adding a new type field setattrin Python.
so my question is is there a way to add a new field to an object of a composite type?

Answer 1

Is there a way to add a new field to an object of a composite type?

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