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This is a comparison of the features of the type systems and type checking of multiple programming languages. Brief definitions * A nominal type system means that the language decides whether types are compatible and/or equivalent based on explicit declarations and names. * A structural type system means that the language decides whether types are compatible and/or equivalent based on the definition and characteristics of the types. * Type checking determines whether and when types are verified. Static checking means that type errors are reported based on a program's text (source code). Dynamic checking means that type errors are reported based on a program's dynamic (run-time) behavior.