Can you tell what's wrong with this Ruby code? 

Hint: I've been writing a lot of TypeScript lately. 😅

#ruby

https://cdn.masto.host/rubysocial/media_attachments/files/111/150/779/643/156/505/original/27546b6bd66159bf.png 

 @98c56911 Erk, I've seen it way too fast; maybe because I, too, make this error on a daily basis !