IE and its broken substr()

substr() is a very simple function for working with strings. It's been around forever, and is well documented. I recently had need to find the last character of a string in javascript. Everything was working fine in Firefox and Chrome, but IE was breaking.


That is, start at 1 character from the end (-1) and return 1 character. In all other browsers this returns 'f' but in IE it returns 'a'.

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