could be used by an IDE to inspect objects runtime

properties.js

// could be used to inspect objects runtime
// e.g. with IDE for suggestion
// requires a modern JS engine in the IDE
var properties = function (
  getNames,     // alias Object.getOwnPropertyNames
  getDescriptor,// alias Object.getOwnPropertyDescriptor
  has,          // alias {}.hasOwnProperty
  toString      // alias Function.prototype.toString
) {
  // (C) WebReflection - Mit Style License
  function inspect(key) {
    var
      self = this,
      object = self.origin,
      methods = self.methods,
      properties = self.properties,
      descriptor = getDescriptor(object, key)
    ;
    if (
      descriptor &&             // valid descriptor
      !/^-?\d+$/.test(key) &&   // not a numeric index
      !~methods.indexOf(key) && // not already in the methods list
      !~properties.indexOf(key) // not already in the properties list
    ) {
      // if there is a value and it's a function
      if (
        has.call(descriptor, "value") &&
        typeof descriptor.value == "function"
      ) {
        // extract the signature and concatenate it to the key
        // e.g. doStuff(stuff,moreStuff)
        self.methods.push(key + toString.call(descriptor.value).replace(
          /^[^(]+?(\([^)]*?\))[^\x00]+$/,
          "$1"
        ));
      }
      // otherwise it's considered a property (even getters/setters)
      else {
        self.properties.push(key);
      }
    }
  }
  // the exposed function
  return function properties(object) {
    var result = {
      properties: [],
      methods: [],
      origin: object
    };
    do {
      // add all possible properties and methods
      getNames(object).forEach(inspect, result);
    } // up to the initial inheritance
      while (object = object.__proto__);
    // avoid leaks
    delete result.origin;
    // return the result with all properties and methods
    return result;
  };
}(
  Object.getOwnPropertyNames,
  Object.getOwnPropertyDescriptor,
  {}.hasOwnProperty,
  Function.toString
);

/* example
console.log(properties({
  getName: function () {
    return this._name;
  },
  setName: function (name) {
    this._name = name;
  }
}));
//*/