LINQ and lambdas - Get Control of your data - join, anonymous types, var keyword

Head First C#:
A Learner's Guide to Real-World Programming
with C# and .NET Core
楽天ブックス

開発環境

Head First C#: A Learner’s Guide to Real-World Programming with C# and .NET Core (Andrew Stellman(著)、Jennifer Greene(著)、O’Reilly Media)のChapter 9(LINQ and lambdas - Get Control of your data)、p.493(Sharpen your pencil)の解答を求めてみる。

コード

using System;
using System.Collections.Generic;
using System.Linq;

namespace MyFirstConsoleApp
{
    class Program
    {
        static void Main(string[] args)
        {
            var players = new[]
            {
                new { Name = "Joe", YearsPlayed = 7, GlobalRank = 21 },
                new { Name = "Bob", YearsPlayed = 5, GlobalRank = 13 },
                new { Name = "Alice", YearsPlayed = 11, GlobalRank  =17 },
            };
            var playerWins = new[]
            {
                new {Name="Joe", Round = 1, Winnings = 1.5M },
                new {Name = "Alice", Round = 2, Winnings = 2M },
                new {Name = "Bob", Round = 3, Winnings = .75M },
                new {Name = "Alice", Round=4, Winnings = 1.3M },
                new {Name = "Alice", Round = 5 , Winnings=.7M },
                new {Name = "Joe", Round = 6, Winnings = 1M },
            };
            var playersStats =
                from player in players
                join win in playerWins
                on player.Name equals win.Name
                orderby player.Name
                select new
                {
                    Name = player.Name,
                    YearsPlayed = player.YearsPlayed,
                    GlobalRank = player.GlobalRank,
                    Round = win.Round,
                    Winnings = win.Winnings,
                };
            var names = new[] {
                "Alice", "Alice", "Alice",
                "Bob",
                "Joe", "Joe",
            };
            var yearsPlayed = new[]
            {
                11, 11, 11,
                5,
                7, 7,
            };
            var globalRanks = new[]
            {
                17, 17, 17,
                13,
                21, 21,
            };
            var rounds = new[]
            {
                2, 4, 5,
                3,
                1, 6,
            };
            var winnings = new[]
            {
                2M, 1.3M, .7M,
                .75M,
                1.5M, 1M,
            };
            int i = 0;
            foreach (var stat in playersStats)
            {
                Console.WriteLine(stat);
                Console.WriteLine(
                    "{0}, {1}, {2}, {3}, {4}",
                    stat.Name == names[i],
                    stat.YearsPlayed == yearsPlayed[i],
                    stat.GlobalRank == globalRanks[i],
                    stat.Round == rounds[i],
                    stat.Winnings == winnings[i]);
                i++;
            }
        }
    }
}

入出力結果(Terminal, Zsh)

{ Name = Alice, YearsPlayed = 11, GlobalRank = 17, Round = 2, Winnings = 2 }
True, True, True, True, True
{ Name = Alice, YearsPlayed = 11, GlobalRank = 17, Round = 4, Winnings = 1.3 }
True, True, True, True, True
{ Name = Alice, YearsPlayed = 11, GlobalRank = 17, Round = 5, Winnings = 0.7 }
True, True, True, True, True
{ Name = Bob, YearsPlayed = 5, GlobalRank = 13, Round = 3, Winnings = 0.75 }
True, True, True, True, True
{ Name = Joe, YearsPlayed = 7, GlobalRank = 21, Round = 1, Winnings = 1.5 }
True, True, True, True, True
{ Name = Joe, YearsPlayed = 7, GlobalRank = 21, Round = 6, Winnings = 1 }
True, True, True, True, True