摘要：
Create a type-safe string join utility which can be used like so: const hyphenJoiner = join('-') const result = hyphenJoiner('a', 'b', 'c'); // = 'a-b 阅读全文
摘要：
Implement a type, UnionToTuple, that converts a union to a tuple. As we know, union is an unordered structure, but tuple is an ordered, which implies 阅读全文