Functional Core, Imperative Shell by Gary Bernhardt. https://www.destroyallsoftware.com/screencasts/catalog/functional-core-imperative-shell https://www.destro

Functional Core, Imperative Shell by Gary Bernhardt. https://www.destroyallsoftware.com/screencasts/catalog/functional-core-imperative-shell https://www.destroyallsoftware.com/screencasts/catalog/funct... I saw it at my first job out of uni and it was so simple that it changed the way I wrote code at the time.