michaeloyer

#r "nuget: CsvHelper"

open System
open CsvHelper

type Transaction = { Amount: float; Date: DateOnly; Description: string }

let readTransactions() : Transaction list = [
    use reader = new IO.StringReader("""
Account Number,Posted Date,Check,Description,Debit,Credit

michaeloyer

open System
open Microsoft.AspNetCore.Builder
open Microsoft.Extensions.Hosting
open Microsoft.Extensions.DependencyInjection
open Microsoft.FSharp.Core
open Microsoft.OpenApi.Models
open Swashbuckle.AspNetCore.SwaggerGen

type Child = { Text: string }
type Parent = { Child: Child option }

michaeloyer

#r "nuget: System.Data.SQLite"
#r "nuget: Dapper"

open System
open Dapper
open System.Data
open System.Data.SQLite

[<CLIMutable>] // This creates private setters for Dapper to work with, but your F# code cannot
type Person = { Id: int; First: string; Last: string }

michaeloyer

// SRTP: Statically Resolved Type Parameters
// https://docs.microsoft.com/en-us/dotnet/fsharp/language-reference/generics/statically-resolved-type-parameters

// SRTP Allows for pulling members out of types that where the member is named and typed the same
// In this example SRTP will be used to pull out the 'First: string' and 'Last: string' members
// from different types

// One example of SRTP in the F# Base Class Library is the (+) operator. 
// You'll see that it has this type signature:

michaeloyer

#r "nuget:FSharp.Data"

open System.IO
open System.Text
open FSharp.Data

type Csv = CsvProvider<"A,B,C\n1,2,3", CacheRows=false>

let csvStream = 
    let stream = new MemoryStream()

michaeloyer

git init
git checkout -b original
git commit --allow-empty -m 'Commit 1'
git commit --allow-empty -m 'Commit 2'
git commit --allow-empty -m 'Commit 3 (third)'
git tag third
git commit --allow-empty -m 'Commit 4'
git commit --allow-empty -m 'Commit 5'
git tag fifth
git commit --allow-empty -m 'Commit 6 (sixth)'

michaeloyer

// Dummy functions to simulate a function that return a result
let getNumber expected resultNumber number =
    if number = expected then
        Ok resultNumber
    else
        Error (sprintf $"Expected {expected} but got {number}")

let getOne = getNumber 0 1
let getTwo = getNumber 1 2
let getThree = getNumber 2 3

michaeloyer

git init SomeRepo   #creates a folder in your current directory called 'SomeRepo'
pushd SomeRepo
git commit -m 'EMPTY' --allow-empty     #branching doesn't work without a commit in the repo
git branch regular-branch
git worktree add -b worktree-branch '../SomeRepo#worktree-branch'      #folder name example, without -b {BranchName} will create a branch with the name of the directory specified
git branch --list
popd
ls | select -exp Name

<#

michaeloyer

type Result = Accepted | Rejected

interface Accepted {
    status: "Accepted"
    text: string
}

interface Rejected {
    status: "Rejected"
}

michaeloyer

function toDateString(date) {
    const year = date.getFullYear();
    const month = date.getMonth() + 1;
    const day = date.getDate();

    return `${year}-${month.toString().padStart(2,'0')}-${day.toString().padStart(2,'0')}`;
}