JSHINT: The __proto__ property is deprecated

Question

I'm using a "hasOwnProperty" function to extend compatibility but JSHint says that the Object.prototype.__proto__ is deprecated. There is a way to rewrite this function to avoid this warning and ensure the compatibility?

var hasOwnProperty = function (obj, prop) {
    var proto = obj.__proto__ || obj.constructor.prototype;
    return (prop in obj) &&
        (!(prop in proto) || proto[prop] !== obj[prop]);
};

Answer 1

The "correct" way to do what you're trying to do is to use the Object.getPrototypeOf function:

var proto = Object.getPrototypeOf(obj);

That's not supported in Internet Explorer 8 and below though so if you need to support old environments you could extend your test to include a check for that, and fall back to __proto__ where necessary.

That will obviously not avoid the JSHint warning though so you'll probably still want to set the proto option to turn it off.