> If you wanted to do something like that in a declarative way, though, consider a spreadsheet with an intelligent evaluator. The spreadsheet is a declaration o

> If you wanted to do something like that in a declarative way, though, consider a spreadsheet with an intelligent evaluator. The spreadsheet is a declaration of a dependency relationship. When a number is changed, the numbers depending upon it change. Seems like you're talking about functional reactive programming (or reactive programming in general).