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Fable has some amazing functional-first libraries. We also offer custom on-site trainings. One of the new samples I want to show, which I also live coded at NDC 2018, is building a simple web-based Excel-like spreadsheet application. You can click on any cell to edit the cells. To confirm your edit, just click on any other cell.
Formulas support parentheses and four standard numerical operators. When you make an edit, the spreadsheet automatically updates. Our types should capture what we work with in a spreadsheet application. 3 and the sheet itself which has user input in some of the cells. A Position is simply a pair of column name and a number. An expression is more interesting, because it is recursive. 3 is an application of a binary operator on sub-expressions A1, which is a reference and 3 which is a numerical constant.
The type Sheet is a map from positions to raw user inputs. We could also store parsed expressions or even evaluated results, but we always need the original input so that the user can edit it. To make things simple, we’ll just store the original input and parse it each time we need to evaluate the value of a cell. We will talk about these later when we discuss the logic behind our spreadsheet, but writing the type down early is useful. Given these types, we can already see how everything fits together. Given a position, we can do a lookup into Sheet to find the entered text, then we can parse it using parse to get Expr and, finally, pass the expression to evaluate to get the resulting value.
Now, all we have to do is to keep writing the rest of Excel until the type checker is happy! Creating user interface using Elmish I’m going to start by discussing the user interface and then get back to implementing the parsing and evaluation logic. For creating user interfaces, Fable comes with a great library called Elmish. Elmish implements a functional-first user interface architecture popularized by the Elm language, which is also known as model view update. The idea of the architecture is extremely simple.