zio-prelude

[//]: # (This file was autogenerated using `zio-sbt-website` plugin via `sbt generateReadme` command.)
[//]: # (So please do not edit it manually. Instead, change "docs/index.md" file or sbt setting keys)
[//]: # (e.g. "readmeDocumentation" and "readmeSupport".)

# ZIO Prelude

[ZIO Prelude](https://github.com/zio/zio-prelude) is a lightweight, distinctly Scala take on **functional abstractions**, with tight ZIO integration.

[![Production Ready](https://img.shields.io/badge/Project%20Stage-Production%20Ready-brightgreen.svg)](https://github.com/zio/zio/wiki/Project-Stages) ![CI Badge](https://github.com/zio/zio-prelude/workflows/CI/badge.svg) [![Sonatype Releases](https://img.shields.io/maven-central/v/dev.zio/zio-prelude_2.13.svg?label=Sonatype%20Release)](https://central.sonatype.com/artifact/dev.zio/zio-prelude_2.13) [![Sonatype Snapshots](https://img.shields.io/maven-metadata/v?metadataUrl=https%3A%2F%2Fcentral.sonatype.com%2Frepository%2Fmaven-snapshots%2Fdev%2Fzio%2Fzio-prelude_2.13%2Fmaven-metadata.xml&label=Sonatype%20Snapshot)](https://central.sonatype.com/repository/maven-snapshots/dev/zio/zio-prelude_2.13/) [![javadoc](https://javadoc.io/badge2/dev.zio/zio-prelude_2.13/javadoc.svg)](https://javadoc.io/doc/dev.zio/zio-prelude_2.13) [![ZIO Prelude](https://img.shields.io/github/stars/zio/zio-prelude?style=social)](https://github.com/zio/zio-prelude)

## Introduction

ZIO Prelude is a small library that brings common, useful algebraic abstractions and data types to scala developers. It is an alternative to libraries like _Scalaz_ and _Cats_ based on radical ideas that embrace **modularity** and **subtyping** in Scala and offer **new levels of power and ergonomics**. It throws out the classic functor hierarchy in favor of a modular algebraic approach that is smaller, easier to understand and teach, and more expressive.

ZIO Prelude has three key areas of focus:

1. **Data structures, and type classes for traversing them.** ZIO Prelude embraces the collections in the Scala standard library, and extends them with new instances and new useful additions.
2. **Patterns of composition for types.** ZIO Prelude provides a small catalog of patterns for binary operators, which combine two values into another value of the same type. These patterns are named after the algebraic laws they satisfy: associativity, commutativity, and identity.
3. **Patterns of composition for type constructors.** ZIO Prelude provides a catalog of patterns for binary operators on type constructors (things like `Future`, `Option`, ZIO `Task`). These patterns are named after the algebraic laws they satisfy (associativity, commutativity, and identity) and the structure they produce, whether a tuple or an either.

Design principles behind ZIO Prelude:

1. **Radical** — So basically it ignores all dogma, and it is completely written with a new mindset.
2. **Orthogonality** — The goal for ZIO Prelude is to have no overlap. Type classes should do one thing and fit it well. So th