Example of Construction Builder in Swift

ConstructionBuilderPattern.swift

struct ObjectToConstruct {
    
    let propertyOne: String?
    let propertyTwo: Array<String>?
    let propertyThree: Bool?
}


class ConstructBuilder {
    
    private var propertyOne: String?
    private var propertyTwo: Array<String>?
    private var propertyThree: Bool?
    
    func withPropertyOne(propertyOne: String) -> ConstructBuilder{
    
        self.propertyOne = propertyOne
        return self
    }
    
    func withPropertyTwo(propertyTwo: Array<String>) -> ConstructBuilder{
        
        self.propertyTwo = propertyTwo
        return self
    }
    
    func withPropertyThree(propertyThree: Bool) -> ConstructBuilder{
        
        self.propertyThree = propertyThree
        return self
    }
    
    func build() -> ObjectToConstruct {
    
        return ObjectToConstruct(propertyOne: self.propertyOne ?? "", propertyTwo: self.propertyTwo ?? [], propertyThree: self.propertyThree ?? false)
    }
}


//MARK: Use of the Construction Builder pattern

let objectWithAllProperties = ConstructBuilder().withPropertyOne("Hola")
                                                .withPropertyTwo(["Hi","Allo"])
                                                .withPropertyThree(true)
                                                .build()


print(objectWithAllProperties)



let objectWithPropertyTwoByDefault = ConstructBuilder().withPropertyOne("Hola")
                    .withPropertyThree(true)
                    .build()

print(objectWithPropertyTwoByDefault)