Equatable Key Paths

equatableKeyPaths

struct AnyEquatableKeyPath<Root> {
    let keyPath: PartialKeyPath<Root>
    let isEqual: (Root, Root) -> Bool
    init<Value: Equatable>(_ keyPath: KeyPath<Root, Value>) {
        self.keyPath = keyPath
        self.isEqual = {left, right in
            return left[keyPath: keyPath] == right[keyPath: keyPath]
        }
    }
}

extension Equatable {
    func isEqualTo(other: Self, byComparing keyPaths:AnyEquatableKeyPath<Self>...) -> Bool {
        return keyPaths.allSatisfy { $0.isEqual(self, other) }
    }
}