A modern programming language that makes developers happier.

kotlinlang

`Day9`
• Generic classes(Using type hierarchies, setting type upper bounds, null checking) / Handling exceptions with check function
• Generic in/out, Covariance/Contravariance , reified, star projections, annotation
• Googling time reading several articles (<https://proandroiddev.com/understanding-generics-and-variance-in-kotlin-714c14564c47|1>) (<https://www.baeldung.com/kotlin/generics|2>) (<https://medium.com/mobile-app-development-publication/in-and-out-type-variant-of-kotlin-587e4fa2944c|3>) related with generics &amp; inheritance (third was especially helpful..)
`Self-Comment`
• Yesterday I just went through basics of generic in kotlin, so I never expected rest of this part will take so long. Generic in&amp;out part took quite a lot of time to understand. :nauseated_face: After some googling I was able to understand it roughly, but still didn’t understand the hood of it yet.
• Somehow I feel I spent too much time and energy on this generic thing.. I got quite frustrated when I felt quite stuck, and was hard to proceed. However as I clicked the same lecture again at night(dawn?), it sounded easier. I should handle this balance of keeping pace while filling out the holes &amp; vice versa.
`Goals-Tomorrow`
• Finish functional manipulation (- Don't get stuck somewhere too long ! ) 

_(- Don't get stuck somewhere too long ! )_

Glad you realized that! I'm still working on it

Sticking to some issue/concept is a good attitude, but losing pace &amp; feeling frustrated is not good I guess :blob-nervous: