We can consider variant as equivalent to constructors, the role of which in Java and C is to set initial value. (초기화)
The site below provides a superb explanation of Ocaml and how variant types work in it
The visual representation of the expressions in tree node really helps with the understanding.
Reference: http://www.mega-nerd.com/erikd/Blog/CodeHacking/Ocaml/variant_types.html
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