>In a declarative system, you express what you want the system to do. You don't tell the system how it should do those things. This is a well solved problem.

>In a declarative system, you express what you want the system to do. You don't tell the system how it should do those things. This is a well solved problem. Spreadsheets are the worlds most popular programming environment. They implement purely functional declarative programming systems that can easily span decades. Easy to comprehend, easy to debug, for the most part.