Defines a global getPrototoypeChain function that returns an array of all the objects which are part of the passed object's prototype chain.

getPrototypeChain.js

var getPrototype = typeof Object.getPrototypeOf === "function" ?
        Object.getPrototypeOf :
		typeof "".__proto__ === "object" ?
			function (obj) {
				return obj ? obj.__proto__ : null;
			} :
			function (obj) {
				return obj && obj.constructor ? obj.constructor.prototype : null;
			},
    nativeIndexOf = Array.prototype.indexOf,
    indexOf = typeof _ === "object" && typeof _.indexOf === "function" ? _.indexOf : function (arr, item) {
        if (arr == null) return -1;
        var i = 0, l = arr.length;
        if (nativeIndexOf && arr.indexOf === nativeIndexOf) return arr.indexOf(item);
        for (; i < l; i++) if (arr[i] === item) return i;
        return -1;
    };
getPrototypeChain = function (obj) { // defines it globally
	var list = [obj];
	while ( obj && (obj = getPrototype(obj)) && obj !== list[list.length - 1] ) {
		if (indexOf(list, obj) === -1) { // Keep it unique
			list.push(obj);
		}
	}
	return list;
}