collection.allElementsEqual

🌀 Collection

💾 程式： replit

// ┌──────────────────────────────────────┐
// │    Collection + .allElementsEqual    │
// └──────────────────────────────────────┘

extension Collection where Element: Equatable {
    /// ```
    /// [1,1,1].allElementsEqual == true
    /// ```
    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,          // ❌
[1, 1, 1].allElementsEqual,          // ✅
[1].allElementsEqual,                // ✅
([] as! [Int]).allElementsEqual,     // ✅
["ya", "ya", "ya"].allElementsEqual, // ✅

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