Show how to use LanguageExt's Eff(ect) with memo to cache value.Note that `LanguageExt.Core` library is needed for running.

Program.cs

using System;
using LanguageExt;
using static LanguageExt.Prelude;

public static class Program {
  public static void Main (string[] args) {
    var program =
      from v1 in Load
      from _1 in eff(() => Console.WriteLine($"1st value = {v1}"))
      from v2 in Load
      from _2 in eff(() => Console.WriteLine($"2st value = {v2}"))
      select unit;

    program.RunUnit();
  }

  static int LoadSomething(){
    Console.WriteLine("Load!");
    return 123;
  }

  // try remove memo for comparision
  static Eff<int> Load = Eff(memo(LoadSomething));

  static Eff<Unit> eff(Action a) => 
    Eff(() => {
      a();
      return unit;
    });
}