Titlebook: Beginner‘s Guide to Kotlin Programming; John Hunt Textbook 2021 The Editor(s) (if applicable) and The Author(s), under exclusive license t

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https://doi.org/10.1007/978-3-642-23666-2Nested and inner types are types that are defined with the scope of an outer (or top-level) type. This chapter introduces nested as well as inner types and considers where and when they can be defined.

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Higher Order FunctionsIn this chapter we will explore the concept of high-order functions. These are functions that take as a parameter, or return (or both), a function. To do this we will first look into how Kotlin represents functions in memory and explore what actually happens when we execute a Kotlin function.

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Curried FunctionsCurrying is a technique which allows new functions to be created from existing functions by . one or more parameters to a specific value. It is a source of reuse of functions in Kotlin which means that functionality can be written once, in one place and then reused in multiple other situations.

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Objects and Companion ObjectsThis chapter will discuss the difference between . in Kotlin and instance of a class. This is important as many other object-oriented languages use these terms interchangeably. However, in Kotlin they are significantly different concepts, defined with different language constructs and used in different ways.