Dynamic scope is extremely useful because it adds referential clarity and discipline to global variables.
2.
While blocks have lexical scope, methods have dynamic scope.
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In fact, dynamic scope originated in this manner.
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In Common Lisp implementations which support multithreading, dynamic scopes are specific to each thread of execution.
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In modern languages, macro expansion in a preprocessor is a key example of de facto dynamic scope.
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Lexical scope is the main focus of this article, with dynamic scope understood by contrast with lexical scope.
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For an individual symbol, it can be switched to dynamic scope, either by a local declaration, by a global declaration.
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With "'dynamic scope "', a global identifier refers to the identifier associated with the most recent environment, and is uncommon in modern languages.
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Alternatively, a variable with dynamic scope is resolved at run-time, based on a global binding stack that depends on the specific control flow.
10.
In Common Lisp, special variables ( with dynamic scope ) are typically surrounded with * in what is dubbed the earmuff convention .
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