pipeline연산자
https://www.proposals.es/proposals/Pipeline%20Operator
레코드, 튜플
https://www.proposals.es/proposals/Record%20%26%20Tuple
set메소드
https://www.proposals.es/proposals/New%20Set%20methods
배열 groupby
https://www.proposals.es/proposals/Array%20Grouping
패턴매칭
https://www.proposals.es/proposals/Pattern%20Matching
할거없어서 찾아봄..
와 좋네
다 너무유용한데 개꿀이네