Working with decimal arrays

instructions.md

1. Create a new Console project and name it WorkingWithArrays
2. Create a new folder named Classes in the project by right clicking on the project name, select Add then New Folder
3. Right click the Classes folder, select Add then New item, name it MockedData.cs
4. Open MockedData.cs and copy and paste the code below.

MockedData.cs

using System.Text.Json;

namespace WorkingWithArrays.Classes;
internal class MockedData
{

    public static decimal[] GetDecimals()
        =>
        [
            99.40m, 98.62m, 98.13m, 96.31m, 85.59m, 78.95m, 62.73m, 58.23m, 57.36m, 57.03m,
            50.41m, 49.46m, 35.86m, 30.07m, 29.84m, 27.56m, 25.73m, 17.10m, 13.95m, 10.32m
        ];

    public static void WriteDecimalsToJson(string filePath, decimal[] values)
    {
        var options = new JsonSerializerOptions
        {
            WriteIndented = true
        };

        string json = JsonSerializer.Serialize(values, options);
        File.WriteAllText(filePath, json);
    }

    public static decimal[] ReadDecimalsFromJson(string filePath)
    {
        if (!File.Exists(filePath))
            throw new FileNotFoundException("JSON file not found.", filePath);

        string json = File.ReadAllText(filePath);
        return JsonSerializer.Deserialize<decimal[]>(json)
               ?? throw new InvalidDataException("Failed to deserialize decimal array.");
    }

    public static JsonSerializerOptions JsonSerializerOptions 
        => new() { WriteIndented = true };
}

Program.cs

using System.Text.Json;

namespace WorkingWithArrays;

internal class Program
{
    static void Main(string[] args)
    {
        
        if (!Directory.Exists("Json"))
        {
            Directory.CreateDirectory("Json");
        }
        
        var fileName = Path.Combine("Json", "decimals.json");

        var decimals = Classes.MockedData.GetDecimals();
        
        Classes.MockedData.WriteDecimalsToJson(fileName, decimals);

        var readDecimals = Classes.MockedData.ReadDecimalsFromJson(fileName);
        var json = JsonSerializer.Serialize(readDecimals, Classes.MockedData.JsonSerializerOptions);
        
        Console.WriteLine(json);

        Console.WriteLine("Press ENTER to exit");
        Console.ReadLine();
    }
}