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Code-golf is a competition to solve a particular problem in the fewest bytes of source code. If you want to score by characters instead of bytes, please state this explicitly in the challenge. If source code length is not the primary scoring criterion, consider using another tag instead.

3
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Smalltalk, 112 132 bytes Smalltalk isn't exactly known for its golfing suitability :-) Method defined in class Character (tested in VA Smalltalk and Squeak, should work in other dialects such as Vis …
answered Apr 18 '18 by Hans-Martin Mosner
0
votes
Smalltalk, 57 bytes Method to be defined in class String: s^(self select:#isLetter)asUppercase asSet size=self size This is most likely self-explanatory.
answered Apr 18 '18 by Hans-Martin Mosner