JavaScriptでgetter-setter

gistfile1.coffee

#Add getter-setter
_prop = (initValue) ->
  do (val = initValue) ->
    _val = val
    (val) ->
      return _val if val is undefined
      _val = val

#Example
myValue = _prop 'hello'
myValue() #=> hello
myValue 'world'
myValue() #=> world

###JavaScript
//Add getter-setter
var _prop, myValue;

_prop = function(initValue) {
  return (function(val) {
    var _val;
    _val = val;
    return function(val) {
      if (val === void 0) {
        return _val;
      }
      return _val = val;
    };
  })(initValue);
};

//Example
myValue = _prop('hello');
myValue(); //=> hello
myValue('world');
myValue(); //=> world
###