摘要：
The contenteditable global attribute is an enumerated attribute indicating if the element should be editable by the user. If so, the browser modifies 阅读全文
摘要：
Implement Trim<T> which takes an exact string type and returns a new string with the whitespace from both ends removed. For example type trimmed = Tri 阅读全文
摘要：
Implement TrimLeft<T> which takes an exact string type and returns a new string with the whitespace beginning removed. For example type trimed = TrimL 阅读全文
摘要：
Sometimes, you may want to lookup for a type in a union to by their attributes. In this challenge, we would like to get the corresponding type by sear 阅读全文