Style-RedundantFilterChain.md

Pattern: Redundant filter chain

Issue: -

Description

Identifies usages of any?, empty? or none? predicate methods chained to select/filter/find_all and change them to use predicate method instead.

Examples

@example
  # bad
  arr.select { |x| x > 1 }.any?

  # good
  arr.any? { |x| x > 1 }

  # bad
  arr.select { |x| x > 1 }.empty?
  arr.select { |x| x > 1 }.none?

  # good
  arr.none? { |x| x > 1 }

  # good
  relation.select(:name).any?
  arr.select { |x| x > 1 }.any?(&:odd?)

@example AllCops:ActiveSupportExtensionsEnabled: false (default)
  # good
  arr.select { |x| x > 1 }.many?

@example AllCops:ActiveSupportExtensionsEnabled: true
  # bad
  arr.select { |x| x > 1 }.many?

  # good
  arr.many? { |x| x > 1 }

Further Reading

• RuboCop - Style/RedundantFilterChain