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Metaprogramming JavaScript
JavaScript allows for metaprogramming through manipulating programs as data. It relies on few but powerful constructs including working with functions, arguments, built-in types, and mechanisms like inheritance at runtime. The key building blocks are objects, numbers, strings, booleans, and undefined, with everything else being objects. Functions are objects that can return other functions, taking advantage of closures to refer to outer variables from inner functions. This flexibility allows for patching implementations, self-optimizing code, custom APIs, and domain-specific languages.
