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<!DOCTYPE html>
<html>
<head>
​
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS LINQ Where(), Select() and OrderBy()</title>
</head>
<body>
​
  <script src="https://code.jquery.com/jquery-1.12.4.js"></script>
  <script>
    function Player(Id, Name, RegDate, Score) {
        this.Id = Id;
        this.Name = Name;
        this.RegDate = RegDate;
        this.Score = Score;
    }
    var p1 = new Player("P1", "Jeffrey", new Date(1900, 0, 1), 32767);
    var p2 = new Player("P2", "Darkthread", new Date(2016, 6, 2), 65536);
    
    //用陣列模擬List<Player>
    var list = [p1, p2];
    
    //Where(o => o.Score > 255)
    var res = $.grep(list, function(o) { return o.Score > 255 });
    console.log("Where(o => o.Score > 255).Count=" + res.length);
    
    //Select(o => new { PlayerId = o.Id, PlayerName = o.Name })
    var res = $.map(list, function(o) { return { PlayerId: o.Id, PlayerName: o.Name }; });
    console.log("Select(o => new { PlayerId = o.Id, PlayerName = o.Name }).Count=" + res.length);
    console.log("res[0].PlayerId=" + res[0].PlayerId);
    console.log("res[1].PlayerName=" + res[1].PlayerName);
    
    //OrderBy(o => o.Name)
    //OrderBy不更動List<T>順序，在JavaScript要用slice(0)先複製新陣列物件
    //以免sort影響原陣列排序
    var sorted = list.slice(0).sort(function(a, b) {
      if (a.Name === b.Name) return 0;
      return (a.Name < b.Name) ? -1 : 1;
    });
    console.log("sorted[0].Name=" + sorted[0].Name);
    console.log("sorted[1].Name=" + sorted[1].Name);
    
    //OrderByDecending(o => o.Score)
    sorted = list.slice(0).sort(function(a, b) {
      if (a.Score === b.Score) return 0;
      return (a.Score > b.Score) ? -1 : 1;
    });
    console.log("sorted[0].Score=" + sorted[0].Score);
    console.log("sorted[1].Score=" + sorted[1].Score);    
  </script>
</body>
</html>
 
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