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---
title: Introduction
description: Standalone inflections
layout: gem-single
order: 18
type: gem
name: dry-inflector
---
dry-inflector is an inflector gem for Ruby, which provides a configurable inflector **object**, rather than using a singleton.
### Basic usage
``` ruby
require "dry/inflector"
inflector = Dry::Inflector.new
inflector.pluralize("book") # => "books"
inflector.singularize("books") # => "book"
inflector.camelize("dry/inflector") # => "Dry::Inflector"
inflector.classify("books") # => "Book"
inflector.demodulize("Dry::Inflector") # => "Inflector"
inflector.constantize("Dry::Inflector") # => Dry::Inflector
inflector.dasherize("dry_inflector") # => "dry-inflector"
inflector.underscore("dry-inflector") # => "dry_inflector"
inflector.humanize("dry_inflector") # => "Dry inflector"
inflector.humanize("author_id") # => "Author"
inflector.tableize("Book") # => "books"
inflector.foreign_key("Book") # => "book_id"
inflector.ordinalize(1) # => "1st"
inflector.ordinalize(2) # => "2nd"
inflector.ordinalize(3) # => "3rd"
inflector.ordinalize(10) # => "10th"
inflector.ordinalize(23) # => "23rd"
```
### Custom inflection rules
``` ruby
require "dry/inflector"
inflector = Dry::Inflector.new do |inflections|
inflections.plural "virus", "viruses" # specify a rule for #pluralize
inflections.singular "thieves", "thief" # specify a rule for #singularize
inflections.uncountable "dry-inflector" # add an exception for an uncountable word
end
inflector.pluralize("virus") # => "viruses"
inflector.singularize("thieves") # => "thief"
inflector.pluralize("dry-inflector") # => "dry-inflector"
```
### Acronyms
```ruby
require "dry/inflector"
inflector = Dry::Inflector.new do |inflections|
inflections.acronym "API", "OpenGL"
end
inflector.camelize("opengl_api") # => "OpenGLAPI"
inflector.underscore("OpenGLAPI") # => "opengl_api"
```
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