bohdanszymanik

import java.time.LocalDateTime
import java.time.format.DateTimeFormatter

fun main(args : Array<String>) {
    var value1 = 1
    var value2 = "2"
    var value3 = 3.0
    var value4 = 4.0
    println(java.lang.String.format("%d, %s, %6f : %3f", value1, value2, value3, value4))

bohdanszymanik

// Exploring validation approaches
// (To start off a no validation option then...)
// Firstly by using an Option type to return Some error text or None if ok - well, actually we end up wrapping the output with Result just because we can
// Secondly by using a Result type and applicative validation a la https://fsharpforfunandprofit.com/posts/elevated-world-3/#validation

open System

module Result = 
  let apply fResult xResult =
    match fResult, xResult with

bohdanszymanik

First should think about this: https://mangelmaxime.github.io/Fulma/#fulma/components/modal

But otherwise...
In NarrativeModal.fs
module Client.NarrativeModal

open System

open Fable.Core
open Fable.Core.JsInterop

bohdanszymanik

argu.5.1.0.nupkg
fake.5.2.0.nupkg
consoletables.2.2.0.nupkg
dapper.1.50.5.nupkg
dotnet-saturn.0.7.1.nupkg
fsharp.core.4.5.0.nupkg
giraffe.1.1.0.nupkg
hopac.0.3.23.nupkg
http.fs.5.3.0.nupkg
microsoft.aspnetcore.2.1.2.nupkg

bohdanszymanik

// I like this active pattern stuff

open System.Globalization

let (|ShortDate|_|) s =
    match DateTime.TryParseExact(s, "ddMMMyyyy", CultureInfo.InvariantCulture, DateTimeStyles.None) with
    | true, d -> Some d
    | _ -> None

let (|LongDate|_|) s =

bohdanszymanik

// 12 step cold-hot colour scale from http://geog.uoregon.edu/datagraphics/color_scales.htm
let rowColourClass (x:double) (min:double) (max:double) =
    let idx =
        match x with
        | x when x > max -> 0
        | x when x < min -> 12
        | _ -> (int)(Math.Round((x - min)/((max - min)/12.)))
    [|"#002aff"; "#1965ff"; "#3299ff"; "#65ccff"; "#99edff"; "#ccffff"; "#ffffcc"; "#ffee99"; "#ffcc65"; "#ff9932"; "#ff6619"; "#ff2a00"|]
    |> Array.rev
    |> fun a -> a.[idx]

bohdanszymanik

# too easy
file.size(list.files("c:\\users\\bohdans\\.atom", recursive=T, include.dirs = F, full.names = T))

bohdanszymanik

// no pattern matching but there are when clauses that return values
fun int2Bool (i:Int): Boolean =
    when (i) {
        0 -> false
        else -> true
    }

fun bool2Int (b:Boolean): Int = // so you can put functions before or after use - not order dependent
        when (b) {
            true -> 1

bohdanszymanik

import java.sql.*

data class eProgProv(val AcaProg: String, val ProvName: String)

val eProgProvs = mutableListOf<eProgProv>()

fun inserteProgProv(cn: Connection, e: eProgProv ) {
    val writeStmt = cn.createStatement()

    fun escStr(s:String) = s.replace("'", "''")

bohdanszymanik

// running in fable.io/repl to check performance on 32 bit win 7 with chrome
type Agent<'T> = MailboxProcessor<'T>
let agent =
  Agent.Start(fun inbox ->
    async { while true do
      let! msg = inbox.Receive()
      printfn "got message '%s'" msg } )

agent.Post "hello"