how to check if charCodeAt() is configurable

Question

Here it is described how to check if innerHTML property is configurable and enumerable using Firebug/FF Web Console. How can I check the same for charCodeAt function? Object.getOwnPropertyDescriptor(HTMLElement.prototype,"charCodeAt") return undefined.

Answer 1

The .charCodeAt() method belongs to Strings, not to HTMLElement:

Object.getOwnPropertyDescriptor(String.prototype,"charCodeAt")

Answer 2

This is because charCodeAt is not a method of HTMLElement, it's a method in the String-Object (or rather its prototype)

Object.getOwnPropertyDescriptor(String.prototype,"charCodeAt")