혼자만의 개발노트

{

  "event": "tennis",

  "teams": [

    {

      "name": "Red",

      "players": [

        { "name": "Kim", "age": 22 },

        { "name": "Lee", "age": 21 }

      ]

    },

    {

      "name": "Blue",

      "players": [

        { "name": "Park", "age": 23 },

        { "name": "Choi", "age": 19 }

      ]

    }

  ]

}

db.game.find(

  { teams: { $elemMatch: { name: "Blue" } } },

  { _id: 0, "teams.$": 1 }

);

{

  "teams": [

    {

      "name": "Blue",

      "players": [

        { "name": "Park", "age": 23 },

        { "name": "Choi", "age": 19 }

      ]

    }

  ]

}

db.game.find(

  { teams: { $elemMatch: { players: { $elemMatch: { name: "Park" } } } } },

  { _id: 0, "teams.$": 1 }

);

# See https://atom.io/docs/latest/creating-a-package#menus for more details

'menu': [

  {

    'label': 'Packages'

    'submenu': [

      'label': 'TypeScript'

      'submenu': [

        { 'label': 'Build', 'command': 'typescript:build' }

        { 'label': 'Go To Declaration', 'command': 'typescript:go-to-declaration' }

        { 'label': 'Create Tsconfig.json', 'command': 'typescript:create-tsconfig.json-project-file' }

      ]

    ]

  }

]

var array = [2, 5, 9];

var key = 3;

console.log('\nData : ' + key);                                  // Data : 3

console.log(array.indexOf(key) + ' : ' + ~array.indexOf(key));   // -1 : 0

console.log(array.indexOf(key) + ' : ' + !~array.indexOf(key));  // -1 : true

console.log(array.indexOf(key) + ' : ' + !array.indexOf(key));   // -1 : false

key = 2;

console.log('\nData : ' + key);                                  // Data : 2

console.log(array.indexOf(key) + ' : ' + ~array.indexOf(key));   // 0 : -1

console.log(array.indexOf(key) + ' : ' + !~array.indexOf(key));  // 0 : false

console.log(array.indexOf(key) + ' : ' + !array.indexOf(key));   // 0 : true

key = 9;

console.log('\nData : ' + key);                                  // Data : 9

console.log(array.indexOf(key) + ' : ' + ~array.indexOf(key));   // 2 : -3

console.log(array.indexOf(key) + ' : ' + !~array.indexOf(key));  // 2 : false

console.log(array.indexOf(key) + ' : ' + !array.indexOf(key));   // 2 : false

apply([thisObj[,argArray]])

call([thisObj[,arg1[,arg2[,..,argN]]]])

function.bind(thisArg[,arg1[,arg2[,...,argN]]])

public class Person

{

    public string Name { get; set; }

    public DateTime Birthday { get; set; }

}

Person person = new Person { Name = "Bob", Birthday = new DateTime (1987, 2, 2) };

string output = Newtonsoft.Json.JsonConvert.SerializeObject (person);

Console.WriteLine (output);

Console.WriteLine();

person = Newtonsoft.Json.JsonConvert.DeserializeObject<Person> (output);

Console.WriteLine ("{0} - {1}", person.Name, person.Birthday);

string json = @"{ Name: 'Bob', HairColor: 'Brown' }";

var bob = Newtonsoft.Json.Linq.JObject.Parse (json);

Console.WriteLine ("{0} with {1} hair", (string)bob["Name"], (string)bob["HairColor"]);

var config = {

    Redis: {

        Host: 'LocalHost'

    }

}

//-------------------------------------------

var a = config.Redis;

var b = config.Chat;

console.dir(a);     // { Host: 'LocalHost' }

console.dir(b);     // undefined

//-------------------------------------------

var c = config.Redis || 'Redis';

var d = config.Chat  || 'Chat';

console.dir(c);     // { Host: 'LocalHost' }

console.dir(d);     // 'Chat'

//-------------------------------------------

var e = config.Redis && 'Redis';

var f = config.Chat  && 'Chat';

console.dir(e);     // 'Redis'

console.dir(f);     // undefined

//-------------------------------------------

var g = config.Redis && config.Redis.Host;

var h = config.Chat  && config.Chat.Port;

console.dir(g);     // 'LocalHost'

console.dir(h);     // undefined

//-------------------------------------------

var i = (config.Redis && config.Redis.Host) || 'google.com';

var j = (config.Chat  && config.Chat.Port)  || 80;

console.dir(i);     // 'LocalHost'

console.dir(j);     // 80

_io = require('socket.io')(port, { transports: ['polling', 'websocket'] });