Codectionary / Developer documentation / Ruby

Ruby select

Ruby reference for ruby select.

Syntax

even = [1, 2, 3, 4].select { |n| n.even? }

Examples

Ruby select example

A focused example you can adapt while practising.

even = [1, 2, 3, 4].select { |n| n.even? }

Best practices

  • Start with the smallest working example, then adapt it to your project.
  • Use the language’s standard library and idioms before introducing extra dependencies.

At a glance

Purpose
Expressive scripting and applications
File extension
.rb
Runs in
Ruby interpreter
Usually used with
Ruby standard library and gems

Specifications & further reading

Related Ruby documentation

Ruby Methods, Blocks & Enumerable
Methods are declared with def and return their final expression unless return is used explicitly. Many collection methods accept blocks, which makes transformations and filtering concise.Ruby each
Ruby reference for ruby each.Ruby times
Ruby reference for ruby times.Ruby map
Ruby reference for ruby map.