Convert string variable to capital letter in VimL

Hello.
I have a string variable and I want to capitalized it letters.
I also need to caoitalize only the first letter, so if I have:
let myStr="example"
Convert myStr word to: Example

I have been searhing in the docs and google but no luck about how to do this in a VimL scripts.

Thanks.

--
Un saludo
Best Regards
Pablo Giménez

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