Li-Fan Chen says to YSITD Basically, any place where it would be an error to write new instead of const, Dart 2 allows you to omit the const. 欸我英文不好 這句的意思是這樣嗎 基本上，任何你把 const 寫成 new 會錯的地方，Dart 2 允許你省略 const