Implementing builders the smart way

The Builder design pattern is one of the most commonly used mechanisms for instantiating complex types in the Java language. It was strongly recommended by Joshua Bloch in the Effective Java book. Bloch says the builders should be used when we need to implement multiple constructors. He also mentions that builder pattern simulates named optional parameters. However, in Kotlin, those arguments for implementing a specialized builder class are no longer valid. Kotlin allows us to provide default values to the class constructor arguments and properties and it has built-in support for named arguments. Given those Kotlin features, there is no need to implement the builders in most scenarios since we can simply achieve their functionality using the language's built-in concepts. However, in Kotlin, we can adapt the Builder pattern to achieve even...