🔰Subscripts

📗 參考

• Sundell ⟩ The power of subscripts in Swift

• Ray ⟩ Custom Subscripts in Swift

📘 手冊

• Swift ⟩ Subscripts

👥 相關

• str[i], str[i..<j], str[i...j]

• Subscripts with Default Arguments

• collection[safe: index]