I re-use my code less across projects in the web, but well designed MVC or MVVM can save you a lot of time. Just by having models available, I can re-use them

I re-use my code less across projects in the web, but well designed MVC or MVVM can save you a lot of time. Just by having models available, I can re-use them on every page. This turned out to be a life saver when I had to analyze / modify a bunch of data- I was able to get a node script up and running over one weekend re-using the existing javascript models and just focus on the analysis, instead of having to recreate everything in Java or Python.