Easily compare two objects by using KeyPath

KeyPathEqualizer.swift

final class KeyPathEqualizer<Object> {
    private let lhs: Object
    private let rhs: Object
    
    private var areEqual: Bool = true
    
    init(lhs: Object, rhs: Object) {
        self.lhs = lhs
        self.rhs = rhs
    }
    
    func compare<T: Equatable>(by keyPath: KeyPath<Object, T>) -> Self {
        guard areEqual else {
            return self
        }
        
        if lhs[keyPath: keyPath] != rhs[keyPath: keyPath] {
            areEqual = false
        }
        
        return self
    }
    
    func build() -> Bool {
        return areEqual
    }
}