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:PROPERTIES:
:ID: c16eb203-290f-4644-8f18-725ffad15e92
:END:
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#+title : Structural Typing
#+begin_quote
A structural type system (or property-based type system) is a major class of
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[[id:c90b53a0-62f7-4115-a417-85e22f55d83d ][Type System ]] in which type compatibility and equivalence are determined by the
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type's actual structure or definition and not by other characteristics such as
its name or place of declaration. Structural systems are used to determine if
types are equivalent and whether a type is a subtype of another.
--- https://en.wikipedia.org/wiki/Structural_type_system
#+end_quote
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Structural type systems can achieve [[id:1882370a-e4df-42a3-ab5a-32b650b754a6 ][static ]] [[id:c50025bd-6942-4a78-b448-ea6fda2925fd ][Duck Typing ]], in that a type's
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structure is what determines its suitability, not its name.
