Elm in Action is that way. Over the course of the book you build a photo sharing application from scratch. Each chapter uses new "feature requests" from a fict

Elm in Action is that way. Over the course of the book you build a photo sharing application from scratch. Each chapter uses new "feature requests" from a fictional manager as a way to introduce and teach new Elm concepts. https://www.manning.com/books/elm-in-action?a_aid=elm_in_action&a_bid=b15edc5c https://www.manning.com/books/elm-in-action?a_aid=elm_in_act... (It's technically in Early Access because the print book hasn't hit the shelves yet, but all the chapters are finished and available in the online version.)