---
title: Introduction
description: A toolset of small support modules used throughout the @dry-rb & @rom-rb ecosystems
layout: gem-single
order: 5
type: gem
name: dry-core
sections:
 - cache
 - constants
 - classes
 - deprecations
 - equalizer
 - extensions
---

`dry-core` is a simple toolset that can be used in many places.

## Features

- [Cache](docs::cache) - allows you to cache call results that are solely determined by arguments.
- [Class Attributes](docs::classes/class-attributes)
- [Class Builder](docs::classes/class-builder)
- [Constants](docs::constants) - a list of constants you can use to avoid memory allocations or identity checks.
- [Deprecations](docs::deprecations)
- [Equalizer](docs::equalizer) - simple mixin providing equality, equivalence and inspection methods.
- [Extensions](docs::extensions)
