Records with mutable data

Program.cs

using System;

Battery battery = new Battery("CR2032", 0.235)
{
    RemainingCapacityPercentage = 100
};

Console.WriteLine (battery);

for (int i = battery.RemainingCapacityPercentage; i >= 0; i--)
{
    battery.RemainingCapacityPercentage = i;
}

Console.WriteLine (battery);

public record Battery(string Model, double TotalCapacityAmpHours)
{
    public int RemainingCapacityPercentage {get;set;}
}

recordsmutable.csproj

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

  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>net5.0</TargetFramework>
    <LangVersion>preview</LangVersion>
    <Nullable>enable</Nullable>
  </PropertyGroup>

</Project>

Produces the following output:

rich@thundera recordmutable % dotnet run
Battery { Model = CR2032, TotalCapacityAmpHours = 0.235, RemainingCapacityPercentage = 100 }
Battery { Model = CR2032, TotalCapacityAmpHours = 0.235, RemainingCapacityPercentage = 0 }

Alternate version, using only immutable data: https://gist.github.com/richlander/bcbbcc9e0b541a06eb805d663ebf6334.