✖️a^^n

Swift ⟩ operator ⟩ a^^n

➕

問：Swift 現在是不是有 ** 運算❓

// custom precedence
precedencegroup PowerPrecedence {
    higherThan   : MultiplicationPrecedence
    associativity: right
}

// custom operator
infix operator ^^ : PowerPrecedence

extension Int {
    /// `a^^n`: a to the n-th power
    public static func ^^(a:Int, n:Int) -> Int {
        precondition(n >= 0, "❌ 目前無法計算負的次方")
        guard n > 0 else { return 1 }
        return (1...n).reduce(1) { (product, i) in
            product * a
        }
    }
}

👥 相關

• is custom operator.

• 👔 EmojiTextFieldStyle