모듈 패턴(Module Pattern) about do-you-know-vanilla HOT 1 OPEN

var Developer = function(arg) {
  var lang = arg ? arg : '';

  return {
    getLang : function() {
      return lang;
    },
    setLang : function(arg) {
      lang = arg;
    }
  
  }
};

var bkjang = new Developer('javascript');

console.log(bkjang.getLang()); //javascript

bkjang.setLang('java');

console.log(bkjang.getLang()); //java

var Developer = function (obj) {
  var developerInfo = obj;

  return {
    getDeveloperInfo: function() {
      return developerInfo;
    }
  };
};

var developer = new Developer({ name: 'BKJang', lang: 'javascript' });

var bkJang = developer.getDeveloperInfo();
console.log('bkJang: ', bkJang);
// bkJang:  {name: "BKJang", lang: "javascript"}

bkJang.lang = 'java'; //인터페이스가 아닌 직접 변경

bkJang = developer.getDeveloperInfo();
console.log('bkJang: ', bkJang);
// bkJang:  {name: "BKJang", lang: "java"}

console.log(Developer.prototype === bkJang.__proto__); //false

var Developer = (function() {
  var lang;

  //생성자 정의
  function Developer(arg) {
    lang = arg ? arg : '';
  }

  Developer.prototype = {
    getLang : function() {
      return lang;
    },
    setLang : function(arg) {
      lang = arg;
    }
  }
  
  return Developer;
}());

var bkJang = new Developer('javscript');

console.log(bkJang.getLang()); //javscript

bkJang.lang = 'java'; //인터페이스를 통해서가 아닌 직접 변경
console.log(bkJang.getLang()); //javscript

bkJang.setLang('java');
console.log(bkJang.getLang()); //java

console.log(Developer.prototype === bkJang.__proto__); //true