'Looks like you've solved it'
use this.valueOf() which provides the actual string which to use. I've spend hours looking for in documentation only to stumble onto it accidentally in my IDE.
The method you're trying to use is not available in the Node version currently supported by CW.
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That's because you have to extend the String.prototype not create a function like you normally do in other katas.
please mention your language
Hi, I'm unable to find the string parameter to be capitalized. Help please