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Minimal coding kata setup

Minimal coding kata setup that I use in my trainings - the aim is to use as simple F# syntax as possible and to have a nice way for specifying placeholders that attendees are required to fill.

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// Minimal setup for coding katas (I usually put this in "setup.fsx")
let __<'T> : 'T = failwith "Placeholder '__' was not filled!"
let shouldEqual a b = 
  if not (a = b) then 
    failwithf "Values are not equal!\n  Expected: %A\n  Received: %A" a b

// Sample tasks with placeholders and equality tests (#loads "setup.fsx")
let nums = 40 + __
shouldEqual nums 42
val failwith : message:string -> 'T

Full name: Microsoft.FSharp.Core.Operators.failwith
val shouldEqual : a:'a -> b:'a -> unit (requires equality)

Full name: Script.shouldEqual
val a : 'a (requires equality)
val b : 'a (requires equality)
val not : value:bool -> bool

Full name: Microsoft.FSharp.Core.Operators.not
val failwithf : format:Printf.StringFormat<'T,'Result> -> 'T

Full name: Microsoft.FSharp.Core.ExtraTopLevelOperators.failwithf
val nums : int

Full name: Script.nums
val __<'T> : 'T

Full name: Script.__
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More information

Link:http://fssnip.net/t5
Posted:1 years ago
Author:Tomas Petricek
Tags: kata , teaching