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Ruby enumerable predicates

Ruby reference for ruby enumerable predicates.

Syntax

numbers = [1, 2, 3]
puts numbers.any?(&:even?)
puts numbers.all?(&:positive?)

Examples

Ruby enumerable predicates example

A focused example you can adapt while practising.

numbers = [1, 2, 3]
puts numbers.any?(&:even?)
puts numbers.all?(&:positive?)

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
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Ruby reference for ruby each.Ruby times
Ruby reference for ruby times.Ruby map
Ruby reference for ruby map.