From Extension Lambdas to expressive Kotlin DSLs

Extension functions, and Lambdas and even Extension Lambdas have both been discussed already (and are assumed knowledge for this page).  But the uses of lambdas goes beyond just functionality, and into the realm of expressive code.  Expressive code is about having the code represent the ideas behind the code more clearly, allowing better reading of the… Continue reading From Extension Lambdas to expressive Kotlin DSLs

Interfaces, Delegation & Composition vs Multiple Inheritance & Duck Typing

Kotlin has Interface, Abstract Classes and Delegation, while Python has multiple inheritance. Different tools, same problems.  The different tools reflect an evolution of what Object Oriented best summed up by: Composition over inheritance. The rethink, the new concepts and how to use them are explained here. Abstract Classes Interfaces:  Duck Typing with Safety Multiple Interfaces… Continue reading Interfaces, Delegation & Composition vs Multiple Inheritance & Duck Typing

Closures, methods, static methods, class methods

Everything you ever wondered about closures, and a few things more: Closures: just what are closures? Closures as code, packaged with parameters Methods as closures: Python Methods as closures: Kotlin Static Methods class level methods/companion object methods Closures: just what are closures? Lets start with an example, and then discuss how it works. The function… Continue reading Closures, methods, static methods, class methods

OOP: Using Kotlin to improve OOP Skills

Ok, Object Oriented Programming (OOP)is not exactly new, and there are lots of pages on OOP on the web.  This page comes from a background of both Python and Kotlin, and how improved programming styles offered by Kotlin can change how you program.  Although Kotlin automates newer techniques and provides assistance coding, you can 'backport'… Continue reading OOP: Using Kotlin to improve OOP Skills

Building in Intellij IDEA

This program is relevant for building your first "hello world" and first sample kotlin apps.  However, once you have even hello world running, it is recommended now to move to gradle for building, even when building with Intellij. The topics for this page: Introduction: why use Intellij at all. The Roles on an IDE What… Continue reading Building in Intellij IDEA