Interfaces Note this blog post contains my notes from the Object Oriented section of the book Atomic Kotlin. Consider buying a copy of the book for a more detailed reference. An interface describes the concept of a type. It is the prototype for all classes that implement the interface. Interfaces describe what a class should do, but not how they should do it. (think protocol in swift) an API is a set of clearly defined communication paths between various software components.

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Kotlin Functional Programming Note this blog post contains my notes from the Functional Programming section of the book Atomic Kotlin. Consider buying a copy of the book for a more detailed reference. Lambdas Lambdas produce compact code that is easier to understand. Lambdas are AKA function literal. Lambdas require a minimal amount of code to create and can be inserted directly into other code. The map() function works with collections such as List.

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Note this blog post contains my notes from the Usability section of the book Atomic Kotlin. Consider buying a copy of the book for a more detailed reference. Extension Functions Extension functions add member functions to existing classes The receiver is the type you extend Example defining an extension function package extensionfunctions import atomictest.eq fun String.singleQuote() = "'$this'" fun String.doubleQuote() = "\"$this\"" fun main() { "Hi".singleQuote() eq "'Hi'" "Hi".doubleQuote() eq "\"Hi\"" } You call extension functions as if they were members of the class

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Introduction to Kotlin Objects Note this blog post contains my notes from the Introduction to Kotlin Objects chapter in the book Atomic Kotlin. Consider buying a copy of the book for a more detailed reference. Objects hold data and perform actions. They store data using properties (vals and vars) and perform actions using functions. Creating Classes Classes are called user-defined types A class member is a property or function of a class

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Introduction to Kotlin Note this blog post is a summary of my notes from the introductory chapter of the book Atomic Kotlin. Consider buying a copy of the book for a more detailed reference. In Kotlin, every data type is an object. You can store either immutable or mutable references to objects. val references are immutable while var references are mutable. To store an object reference to an identifier use an assignment statement:

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