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I used to access individual characters of a string using string[n].
But when I do this in IE8 it always returns undefined when I do this.
I can use string.substr(n, 1) to do the same thing, but the syntax is much longer. Why did they do this?
That form of character access is not part of the ECMAScript standard, but is implemented by some VMs. I would go with charAt as RoBorg suggested and avoid unstandardized features.