6.12 Thematic Takeaways
Programming language concepts often have options, as with scoping (static or dynamic) and nonlocal reference binding (deep, shallow, or ad hoc).
A closure—a function that remembers the lexical environment in which was created—is an essential element in the study of language concepts.
The concept of binding is a universal and fundamental concept in programming languages. Languages have many different types of bindings; for example, scope refers to the binding of a reference to a declaration.
Determining the scope in a programming language that uses manifest typing is challenging because manifest typing blurs the distinction between a variable declaration and a variable reference.
Lexically scoped identifiers are useful ...
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