In common lisp, during development, you can fix a surprising number of mistakes before the browser times out: especially mistakes involving things like typos.

In common lisp, during development, you can fix a surprising number of mistakes before the browser times out: especially mistakes involving things like typos. The other advantage of the condition/restart system is that it makes your libraries more reusable: rather than having either to choose one error handling strategy or to construct a system for choosing an error handling strategy, the language itself provides a construct for making several error handling strategies available that higher-level code can choose between in a straightforward manner.