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Posts tagged f#
Asked How to implement map using the fish (>=>, Kleisli composition) operator in F#? a couple of hours ago, and r~~'s answer blew my mind: let map f = id >=> switch f It is perfect ...
I'm learning monadic composition through Scott Wlaschin's Railway-oriented Programming post. Oncebind, switch, and >=> functions are defined, he introduces map to show how to "turn a one-trac...
Having some trouble with giraffe-template on Mac M1, so decided to set up a Giraffe project manually. Started following the Doing it manually section of the Giraffe README, but got stuck right away...
For example, given a mergeErrors function where input is always a list of Error strings, let es = [ Error 1; Error 2; Error 3 ] let mergeErrors<'a> (errors: Result<'a,int> list) : R...
The Null Values article in the F# Language Reference show an example that uses it, but it does not explain what it does exactly. You can use the following code to check if an arbitrary value is ...
The F# language guide (see Signatures article) has a very sparse definition of what a "sealed" type is: Attribute Description [<Sealed>] For a type that has no abstract me...
The answer provided in the How to set the cell color to a user defined value using NPOI from F#? thread solves the problem of how to set the right properties using F#, but it uses a new ICellStyle ...
As far as I can tell (from F# at least), cell can only be colored using predefined NPOI.SS.UserModel.IndexedColors. From the available methods / properties, val it: ICellStyle = NPOI.XSSF.UserM...
Taking the example from this Stackoverflow question: type Vector2D(dx : float, dy : float) = static let zero = Vector2D(0.0, 0.0) static let onex = Vector2D(1.0, 0.0) static let ...
What I would like to do: Set a cell value. Check with a program if cell values conform to data validation rules. I could extract all the information needed to create a validation function, b...
Are any of the popular Excel .NET projects have a functionality similar to Apache POI's DataValidationEvaluator class?
Just getting into F#, finally figured out how to add .NET packages to projects, but the way I managed to get it to work doesn't make sense. Once the package is installed (either with nuget or paket...
More specifically: Is there a dedicated docs page listing "properties" that are idiosyncratic to F# .fsproj project files? Why am I asking? Started learning F# a couple of days ago, but just now ...
