What are the advantages of dynamic scoping?

Question

I\'ve learned that static scoping is the only sane way to do things, and that dynamic scoping is the tool of the devil, and results only from poor implementations of interpr

Answer 1

Dynamically scoped variables are a powerful, but also sometimes unintuive and dangerous tool.

Imagine you want to have thread specific global variables, i.e. every thread has its own set of global variables. This can easily be done with dynamic scope. Just change the references to this variables at thread initialization.

Or think about exceptions: they are dynamically scoped in most languages. If you had to build an exceptions system from scratch, you could easily do that with dynamically scoped variables.