THE REFERENCE FOR YOUR NEXT LINE

Ruby, at your
fingertips.

Find the class. Understand the method.
Get back to building with clear, versioned Ruby documentation.

Core classes, modules and standard libraries.

a little Ruby goes a long wayrb

# A collection, transformed.
words = ["hello", "ruby", "world"]

words.map { |word| word.capitalize }
     .join(" · ")

"Hello · Ruby · World"Read the docs

A good place to start

Explore the API

ArrayOrdered collections StringText & characters HashKey–value pairs EnumerableCollection methods IntegerWhole numbers ObjectBase methods

Your Ruby. Your reference.

Choose the documentation that matches your project.

Ruby 4.0.6CURRENT DOCS Ruby 3.4.1Complete API documentation Ruby 3.3.7Complete API documentation Ruby 3.2.6Complete API documentation Ruby 3.1.6Complete API documentation Ruby 3.0.7Complete API documentation

Browse all Ruby versions

Every version has a place.

Find earlier releases, core references and standard libraries.

104 entries

3.1.1 Core 3.1.1 standard library

3.1.0 Core 3.1.0 standard library

Complete 3.0.6

Complete 3.0.5

Complete 3.0.4

3.0.3 Core 3.0.3 standard library

3.0.2 Core 3.0.2 standard library

3.0.1 Core 3.0.1 standard library

3.0.0 Core 3.0.0 standard library

Complete 2.7.8

Complete 2.7.7

Complete 2.7.6

2.7.5 Core 2.7.5 standard library

2.7.4 Core 2.7.4 standard library

2.7.3 Core 2.7.3 standard library

2.7.2 Core 2.7.2 standard library

2.7.1 Core 2.7.1 standard library

2.7.0 Core 2.7.0 standard library

2.6.10 Core 2.6.10 standard library

2.6.9 Core 2.6.9 standard library

2.6.8 Core 2.6.8 standard library

2.6.7 Core 2.6.7 standard library

2.6.6 Core 2.6.6 standard library

2.6.5 Core 2.6.5 standard library

2.6.4 Core 2.6.4 standard library

2.6.3 Core 2.6.3 standard library

2.6.2 Core 2.6.2 standard library

2.6.1 Core 2.6.1 standard library

2.6 Core 2.6 standard library

2.5.9 Core 2.5.9 standard library

2.5.8 Core 2.5.8 standard library

2.5.7 Core 2.5.7 standard library

2.5.6 Core 2.5.6 standard library

2.5.5 Core 2.5.5 standard library

2.5.4 Core 2.5.4 standard library

2.5.3 Core 2.5.3 standard library

2.5.2 Core 2.5.2 standard library

2.5.1 Core 2.5.1 standard library

2.5.0 Core 2.5.0 standard library

2.4.10 Core 2.4.10 standard library

2.4.9 Core 2.4.9 standard library

2.4.8 Core 2.4.8 standard library

2.4.7 Core 2.4.7 standard library

2.4.6 Core 2.4.6 standard library

2.4.5 Core 2.4.5 standard library

2.4.4 Core 2.4.4 standard library

2.4.3 Core 2.4.3 standard library

2.4.2 Core 2.4.2 standard library

2.4.1 Core 2.4.1 standard library

2.4.0 Core 2.4.0 standard library

2.3.8 Core 2.3.8 standard library

2.3.7 Core 2.3.7 standard library

2.3.6 Core 2.3.6 standard library

2.3.5 Core 2.3.5 standard library

2.3.4 Core 2.3.4 standard library

2.3.3 Core 2.3.3 standard library

2.3.2 Core 2.3.2 standard library

2.3.1 Core 2.3.1 standard library

2.3.0 Core 2.3.0 standard library

2.2.10 Core 2.2.10 standard library

2.2.7 Core 2.2.7 standard library

2.2.6 Core 2.2.6 standard library

2.2.5 Core 2.2.5 standard library

2.2.4 Core 2.2.4 standard library

2.2.3 Core 2.2.3 standard library

2.2.2 Core 2.2.2 standard library

2.2.1 Core 2.2.1 standard library

2.2.0 Core 2.2.0 standard library

2.1.9 Core 2.1.9 standard library

2.1.8 Core 2.1.8 standard library

2.1.7 Core 2.1.7 standard library

2.1.6 Core 2.1.6 standard library

2.1.5 Core 2.1.5 standard library

2.1.4 Core 2.1.4 standard library

2.1.3 Core 2.1.3 standard library

2.1.2 Core 2.1.2 standard library

2.1.1 Core 2.1.1 standard library

2.1.0 Core 2.1.0 standard library

2.0.0 Core 2.0.0 standard library

1.9.3 core 1.9.3 standard library

Keywords defined in 1.9.

MRuby core

Trunk core Trunk standard library

1.9.2 core 1.9.1 standard library

1.9.1 core 1.9.1 standard library

1.8.7 core 1.8.7 standard library

1.8.6 core 1.8.6 standard library

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