We might also denote multiple parameters using parentheses. A and B are generic placeholders for whatever the actual types might be, like String or Int. For example, A => B means a function that takes a parameter of some type A and returns some other type B. However, for the purposes of this introduction, we can use a container model to develop a preliminary understanding of monads.Ī note on nomenclature: When we talk about functions, we will often use the => notation to describe the structure of a function. While we’re talking about monads here in the context of containers, there’s a wider domain of application that includes things like keeping track of state or performing I/O, in a functional programming paradigm. This will especially help developers who are working with Scala for the first time, e.g, developers learning Scala for data and machine learning engineering using tools such as Spark and Flink. By understanding the basic building blocks that Scala collections are constructed from, we can gain an intuitive understanding of how they work and more naturally solve problems in our day-to-day code. Scala collections and related containers are built around monads, and share a number of properties (and methods) because of this. We’re going to introduce monads along with Scala collections because of how important monads as a concept are to Scala’s internals. In order to get the most out of this series, readers should have a basic understanding of functional collections in Scala (or a Java-based library like VAVR), specifically operations such as map, reduce, and flatten. Mastering monads along with Scala collections will lead to much more robust, idiomatic and functional Scala, and is a heck of a lot more fun than reinventing the wheel when these two abstractions are perfect for the problems that they help to solve. We hope that this guide is both educational and inspirational.
SCALA COLLECTIONS CODE
This document is intended to provide an educational guide for beginning developers working in Scala, to enhance their understanding of both Scala collections and monads in order to improve code quality and developer fluency. A Guide to Scala Collections: Exploring Monads in Scala Collections
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