kotaroito · August 29, 2015 14:05
diff --git a/jsbin.nopof.html b/jsbin.nopof.html
 <!DOCTYPE html>
 <html>
 <head>
  <meta charset="utf-8">
  <title>JS Bin</title>
 </head>
 <body>

 </body>
 </html>
diff --git a/prototype.js b/prototype.js
 var MyObject = (function() {
  function F() {
    this.keysStartWithLetterA = function () {
      for (var key in this) {
        if ( key.substring(0,1) === "a" )
          console.log(key);
      }
    };
  }
  return function(proto) {
    F.prototype = proto;
    var f = new F();
    return f;
  };
 })();

 var obj = MyObject({foo:1, a1: 1});
 obj.keysStartWithLetterA();
	var MyObject = (function() {
	function F() {
	this.keysStartWithLetterA = function () {
	for (var key in this) {
	if ( key.substring(0,1) === "a" )
	console.log(key);
	}
	};
	}
	return function(proto) {
	F.prototype = proto;
	var f = new F();
	return f;
	};
	})();

	var obj = MyObject({foo:1, a1: 1});
	obj.keysStartWithLetterA();