arr.allElementsEqual

檢查是不是所有元素都相等。

🌀 Array

💾 程式： replit

extension Array where Element: Equatable {
    /// `array.allElementsEqual`
    public var allElementsEqual: Bool {
        // always true for empty arrays
        guard first != nil else { return true }
        return dropFirst().allSatisfy { $0 == first! }
    }
}

💈範例

[1, 2, 3].allElementsEqual          // F
[1, 1, 1].allElementsEqual          // T
[1].allElementsEqual                // T
([] as! [Int]).allElementsEqual     // T
["ya", "ya", "ya"].allElementsEqual // T

📘 手冊

• Swift ⟩ Array ⟩

  • allSatisfy(_:)

  • elementsEqual(_:)

🗣 討論

• check if all elements of an array have the same value in Swift

👥 相關

• similar to .allElementsSameLength.