https://github.com/mdesantis/proc_for_case_equality

proc_for_case_equality - Ruby gem for using procs in case comparisons
https://github.com/mdesantis/proc_for_case_equality

Last synced: 5 months ago
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proc_for_case_equality - Ruby gem for using procs in case comparisons

• Host: GitHub
• URL: https://github.com/mdesantis/proc_for_case_equality
• Owner: mdesantis
• License: mit
• Created: 2012-01-20T11:21:45.000Z (over 14 years ago)
• Default Branch: master
• Last Pushed: 2012-01-20T16:17:06.000Z (over 14 years ago)
• Last Synced: 2026-01-13T06:40:38.115Z (5 months ago)
• Language: Ruby
• Homepage: https://github.com/mdesantis/proc_for_case_equality
• Size: 148 KB
• Stars: 1
• Watchers: 0
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.rdoc
  • Changelog: CHANGELOG
  • License: LICENSE

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README

          
= ProcForCaseEquality.new { puts 'procs in case statements are cool!' }

== Features

Simple yet powerful: it lets you use procs for case comparisons (see the example below).

== How

+case+ statements call the === method, so I wrote a +ProcForCaseEquality+ class

that inherits from +Proc+ and overrides ===, letting the case statement call the proc

passing the value of the case as argument.

The source code is so simple that I can put it in full here:

    class ProcForCaseEquality < Proc

      def ===(*params)

        self.call *params

      end

    end

5 LOCs :P

== Installation

gem install proc_for_case_equality

== Usage / Examples

    require 'proc_for_case_equality' # OR:

    require 'proc_for_case_equality/pfce' # if you want PFCE constant to point to ProcForCaseEquality

    # Define some procs

    all_multiples_of_3 = ProcForCaseEquality.new { |numbers| numbers.all? { |number| number.modulo(3).zero? } }

    any_multiple_of_3  = PFCE.new { |numbers| numbers.any? { |number| number.modulo(3).zero? } } # PFCE is provided by 'proc_for_case_equality/pfce'

    # Here we come

    case [1, 2, 3]

    when all_multiples_of_3 

      puts 'all numbers are multiples of 3'

    when any_multiple_of_3

      puts 'at least one number is multiple of 3'

    else

      puts 'no multiples of 3'

    end

== Inspired by

{This article}[http://www.aimred.com/news/developers/2008/08/14/unlocking_the_power_of_case_equality_proc/]

== License

MIT (see {LICENSE}[https://github.com/ProGNOMmers/proc_for_case_equality/blob/master/LICENSE])