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.
3.
In fact, dynamic scope originated in this manner.
4.
In Common Lisp implementations which support multithreading, dynamic scopes are specific to each thread of execution.
5.
In modern languages, macro expansion in a preprocessor is a key example of de facto dynamic scope.
6.
Lexical scope is the main focus of this article, with dynamic scope understood by contrast with lexical scope.
7.
For an individual symbol, it can be switched to dynamic scope, either by a local declaration, by a global declaration.
8.
With "'dynamic scope "', a global identifier refers to the identifier associated with the most recent environment, and is uncommon in modern languages.
9.
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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