Subscripts with Default Arguments

📦 BucketList

👉 paiza.io

struct BucketList {

    var items: [String]
 
    // ⭐️ subscript with default value
    subscript(index: Int, default: String = "your list is over") -> String {
        if index >= 0 && index < items.count {
            return items[index]
        } else {
            return `default`
        }
    }
}

💈 範例

👉 paiza.io

let bucketList = BucketList(items: [
    "travel to Italy", 
    "have children", 
    "watch super bowl"
])

print(bucketList[0])    // travel to Italy
print(bucketList[4])    // your list is over

📗 參考

• InfoQ ⟩ Swift 5.2 Brings callAsFunction, Subscript with Default Arguments, and More
• Donny Wals ⟩ Adding default values to subscript arguments in Swift 5.2