Quote: abstract data types are important; provide access to a type's values through constants and functions; no access to implementation; like a primitive type

Quotation Skeleton

Perhaps the most important development [in programming languages] has been … new types to languages that can be treated … a collection of constants, functions, and procedures on … the type. In particular, access to values of … [e.g., Modula-2 and Ada-83] … [This allows programmers to change an implementation without changing its uses.]   Google-1   Google-2

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