Why does Chrome Dev Tool show a dates __proto__ as Invalid Date?
JavascriptGoogle Chrome-DevtoolsJavascript Problem Overview
I know __proto__ is deprecated (or not part of the standard) and all that but I'm still curious as to what it means when it says Invalid Date when I look at the __proto__ value of..
var myDate = new Date(1331869050000);
Javascript Solutions
Solution 1 - Javascript
>"I'm still curious as to what it means when it says Invalid Date"
That's simply the toString value of the prototype object of the Date constructor function.
Date.prototype.toString(); // "Invalid Date"
You can override it if you like...
Date.prototype.toString = function() { return "I like turtles." };
var myDate = new Date(1331869050000);
myDate.__proto__; // I like turtles.
A little off topic, but __proto__ is in the current working draft for the next version of ECMAScript, codename Harmony.
http://wiki.ecmascript.org/doku.php?id=harmony:specification_drafts
> - Added section B.3.1 with specifies __proto__ feature.
Solution 2 - Javascript
considering you made a new Date object, I wouldn't worry about it. The reason being, if you try this code:
var myDate = new Date(1331869050000);
alert(typeof myDate.getMonth != 'undefined') //true
This will determine that you are inheriting the Date objects methods and that in fact, Date IS defined.
If you would like further investigation, take a look at this post.
Solution 3 - Javascript
The prototype of a Date instance has no defined value. Only the instance has a value. You define it when you instantiate it.