Making filtering out specific types from an object, and specific elements optional.
constant (상수)와 const fn
const keyword, const fn, and miri
모나드 bind 함수 구현하기
Implementing the monadic bind function.
클로저(closure)는 항상 새로운 타입인가?
How Closures Work?
간편한 함수 오버로딩 구현하기
Implementing function overloading using structs and traits.