📝Dynamic scoping is a better model for global variables

source: Seibel₂₀₀₅

Dynamic scoping for global variables allows for better dependency injection and testability. You can override the variable’s value for one function call without affecting the rest of the program.

They can parameterize the behavior of a module in a disciplined way; they are “tamed” global variables that support concurrency and re-entrance. —https://wiki.c2.com/?SpecialVariable

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📝 Dependency injection
📝 Reader/State vs dynamic scoping
📝 § Effect system
📝 Global variables to pass rarely-used dependencies
📝 Dynamic scoping

See also

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