Rendezvous.FruitStand

Program.cs

// Kept the example run as-is, with the following exceptions:
//   1. Changed "let" to "var"
//   2. Added "new" on line 7
//   3. Added semicolons to the statements

// Create a new fruit stand
var stand = new FruitStand();

// Add fruits to the stand
stand.addFruit("apple", 10, 0.5);
stand.addFruit("banana", 5, 0.2);
stand.addFruit("cherry", 20, 0.1);

// Update the quantity of an existing fruit
stand.updateQuantity("banana", 10);

// Calculate the total value of all fruits in the stand
console.log(stand.totalValue());

internal class FruitStand
{
	private Dictionary<string, Tuple<int, double>> _d = new();

	public void addFruit(string fruit, int quantity, double cost)
	{
		_d.Add(fruit, new(quantity, cost));
	}

	public void updateQuantity(string fruit, int quantity)
	{
		_d[fruit] = new(quantity, _d[fruit].Item2);
	}

	public double totalValue() =>
		_d.Sum(i => i.Value.Item1 * i.Value.Item2);
}

#pragma warning disable CS8981 // allow lowercase first letter w/o warning
internal static class console
#pragma warning restore CS8981
{
	public static void log(object o) =>
		Console.WriteLine(o.ToString());
}

Rendezvous.FruitStand.csproj

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>net8.0</TargetFramework>
    <ImplicitUsings>enable</ImplicitUsings>
    <Nullable>enable</Nullable>
  </PropertyGroup>

</Project>

run.txt

[rnelson@roto Rendezvous.FruitStand]$ dotnet build
MSBuild version 17.8.5+b5265ef37 for .NET
  Determining projects to restore...
  All projects are up-to-date for restore.
  Rendezvous.FruitStand -> /home/rnelson/dev/Rendezvous.FruitStand/bin/Debug/net8.0/Rendezvous.FruitStand.dll

Build succeeded.
    0 Warning(s)
    0 Error(s)

Time Elapsed 00:00:00.98
[rnelson@roto Rendezvous.FruitStand]$ dotnet run
9
[rnelson@roto Rendezvous.FruitStand]$