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Types and Programming Languages ReviewThis text is perhaps the most accessible yet thorough introduction to type systems I've encountered.On the one hand, it offers excellent grounding: practical motivation is provided, numerous examples illustrate the concepts, and implementations are provided which can be used to typecheck and evaluate these examples. At various points, extended demonstrations of the type systems under consideration are given (e.g. showing how objects may be encoded). The exercises are well constructed and in many cases, accompanied with answers and detailed explanations in the appendix.
On the other hand, it offers an excellent exposition of the material: Pierce provides a lucid account of the static and dynamic semantics (primarily small-step operational) for various lambda calculi. He proceeds in a stepwise fashion via the gradual accretion of features: from first order (simply typed) systems to higher order systems incorporating bounded subtyping and recursion. He also gives attention to the metatheory of these systems (focusing on proofs of progress and preservation, and for systems with subtyping, of decideability). Internally, the text is well organized, with clear dependencies among the chapters, and the bibliography is extensive.
It should be noted that, while reasonably comprehensive, the text is necessarily limited in scope. For example, aside from the discussion on Featherweight Java, systems other than typed lambda calculus variants are not considered. In my opinion, the focus on these (in some sense "low-level") calculi makes foundational issues more apparent, and the linear progression from simple to complex variants lends a pleasant cohesiveness that would have been lost in a more general survey. However, as object/class encodings were discussed at various points, it would have been nice to see a more integrated presentation, in the spirit of the paper Comparing Object Encodings [BCP97].Types and Programming Languages OverviewA type system is a syntactic method for automatically checking theabsence of certain erroneous behaviors by classifying program phrases according tothe kinds of values they compute. The study of type systems--and of programminglanguages from a type-theoretic perspective -- -has important applications insoftware engineering, language design, high-performance compilers, and security.Thistext provides a comprehensive introduction both to type systems in computer scienceand to the basic theory of programming languages. The approach is pragmatic andoperational; each new concept is motivated by programming examples and the moretheoretical sections are driven by the needs of implementations. Each chapter isaccompanied by numerous exercises and solutions, as well as a runningimplementation, available via the Web. Dependencies between chapters are explicitlyidentified, allowing readers to choose a variety of paths through the material.Thecore topics include the untyped lambda-calculus, simple type systems, typereconstruction, universal and existential polymorphism, subtyping, boundedquantification, recursive types, kinds, and type operators. Extended case studiesdevelop a variety of approaches to modeling the features of object-orientedlanguages.
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