Your SlideShare is downloading. ×
0
cycle (MOTM 2010.07)
cycle (MOTM 2010.07)
cycle (MOTM 2010.07)
cycle (MOTM 2010.07)
cycle (MOTM 2010.07)
cycle (MOTM 2010.07)
cycle (MOTM 2010.07)
cycle (MOTM 2010.07)
cycle (MOTM 2010.07)
cycle (MOTM 2010.07)
cycle (MOTM 2010.07)
cycle (MOTM 2010.07)
cycle (MOTM 2010.07)
cycle (MOTM 2010.07)
cycle (MOTM 2010.07)
cycle (MOTM 2010.07)
cycle (MOTM 2010.07)
cycle (MOTM 2010.07)
cycle (MOTM 2010.07)
cycle (MOTM 2010.07)
cycle (MOTM 2010.07)
cycle (MOTM 2010.07)
cycle (MOTM 2010.07)
Upcoming SlideShare
Loading in...5
×

Thanks for flagging this SlideShare!

Oops! An error has occurred.

×
Saving this for later? Get the SlideShare app to save on your phone or tablet. Read anywhere, anytime – even offline.
Text the download link to your phone
Standard text messaging rates apply

cycle (MOTM 2010.07)

546

Published on

Ruby Method of the Month 2010.07. Lightning talk for the Columbus Ruby Brigade.

Ruby Method of the Month 2010.07. Lightning talk for the Columbus Ruby Brigade.

Published in: Technology
0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total Views
546
On Slideshare
0
From Embeds
0
Number of Embeds
1
Actions
Shares
0
Downloads
2
Comments
0
Likes
0
Embeds 0
No embeds

Report content
Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
No notes for slide


















  • Transcript

    • 1. cycle Method of the Month Kevin Munc @muncman
    • 2. cycle It cycles through the values fed to it, returning one value each invocation, over and over.
    • 3. ActionView::Helpers::TextHelper
    • 4. Console Setup irb --> require 'active_support' ==> true irb --> require 'action_view' ==> ["ActionView"] irb --> class Object >> include ActionView::Helpers::TextHelper >> end ==> Object
    • 5. Simple Example > items = (1..6).to_a ==> [1, 2, 3, 4, 5, 6] > items.each { |i| puts "#{i}: #{cycle('odd','even')}" } 1: odd 2: even 3: odd 4: even 5: odd 6: even
    • 6. With More Elements > items.each do |i| puts "#{i}: #{cycle('odd','even','chunky','bacon')}" end 1: odd 2: even 3: chunky 4: bacon 5: odd 6: even
    • 7. Mo’ Methods, Mo’ Examples reset_cycle current_cycle irb --> set_one = [0,1,2] ==> [0, 1, 2] irb --> set_two = %w{a b c} ==> ["a", "b", "c"]
    • 8. Multiple Cycles w/ Naming set_one.each do |s1| prefix = cycle('even','odd', :name => 'outer') set_two.each do |s2| suffix = cycle('yin','yang', :name => 'inner') puts "#{prefix} #{s1} #{s2} #{suffix}" end end
    • 9. Multiple Cycles w/ Naming set_one.each do |s1| even 0 a yin prefix = cycle('even','odd', :name => 'outer') even 0 b yang set_two.each do |s2| even 0 c yin suffix = cycle('yin','yang', :name => 'inner') odd 1 a yang puts "#{prefix} #{s1} #{s2} #{suffix}" odd 1 b yin end odd 1 c yang end even 2 a yin even 2 b yang even 2 c yin
    • 10. Restarting Named Cycles set_one.each do |s1| prefix = cycle('even','odd', :name => 'outer') set_two.each do |s2| suffix = cycle('yin','yang', :name => 'inner') puts "#{prefix} #{s1} #{s2} #{suffix}" end reset_cycle('inner') end
    • 11. Restarting Named Cycles set_one.each do |s1| even 0 a yin prefix = cycle('even','odd', :name => 'outer') even 0 b yang set_two.each do |s2| even 0 c yin suffix = cycle('yin','yang', :name => 'inner') odd 1 a yin puts "#{prefix} #{s1} #{s2} #{suffix}" odd 1 b yang end odd 1 c yin reset_cycle('inner') even 2 a yin end even 2 b yang even 2 c yin
    • 12. reset_cycle('inner') reset_cycle('outer')
    • 13. Get the cycle w/out advancing? set_one.each do |s1| puts "#{s1} - #{cycle('on','off')}" puts "#{s1} - #{cycle('on','off')}" end
    • 14. Get the cycle w/out advancing? set_one.each do |s1| 0 - on puts "#{s1} - #{cycle('on','off')}" 0 - off puts "#{s1} - #{cycle('on','off')}" 1 - on end 1 - off 2 - on 2 - off
    • 15. Get the cycle w/out advancing? set_one.each do |s1| 0 - on puts "#{s1} - #{cycle('on','off')}" 0 - off puts "#{s1} - #{cycle('on','off')}" 1 - on end 1 - off 2 - on Nope. 2 - off
    • 16. Get the cycle w/out advancing? set_one.each do |s1| puts "#{s1} - #{cycle('on','off')}" puts "#{s1} - #{current_cycle}" end
    • 17. Get the cycle w/out advancing? set_one.each do |s1| 0 - on puts "#{s1} - #{cycle('on','off')}" 0 - on puts "#{s1} - #{current_cycle}" 1 - off end 1 - off 2 - on 2 - on
    • 18. Get the cycle w/out advancing? set_one.each do |s1| 0 - on puts "#{s1} - #{cycle('on','off')}" 0 - on puts "#{s1} - #{current_cycle}" 1 - off end 1 - off 2 - on Yep. 2 - on
    • 19. Another Example set_one.each do |s1| cycle('ruby','rails','bacon', :name => 'outer') set_two.each do |s2| puts "Inner: #{cycle('C','R','B', :name => 'inner')} and Outer is still #{current_cycle('outer')}" end end
    • 20. Another Example set_one.each do |s1| cycle('ruby','rails','bacon', :name => 'outer') set_two.each do |s2| puts "Inner: #{cycle('C','R','B', :name => 'inner')} and Outer is still #{current_cycle('outer')}" end Inner: C and Outer is still ruby end Inner: R and Outer is still ruby Inner: B and Outer is still ruby Inner: C and Outer is still rails Inner: R and Outer is still rails Inner: B and Outer is still rails Inner: C and Outer is still bacon Inner: R and Outer is still bacon Inner: B and Outer is still bacon
    • 21. The cycle method In Rails (not Array#cycle) Often used to ‘zebra stripe’ table rows Supported by: reset_cycle current_cycle cycle names (default is ‘default’)
    • 22. RRBO.com uses many methods!
    • 23. Don’t forget to check out rrbo.com ! Questions? Photo Credits http://www.flickr.com/photos/falconmotorcycles/3556349741/ http://www.flickr.com/photos/falconmotorcycles/3556350229/ http://www.flickr.com/photos/falconmotorcycles/3556345789/ http://www.flickr.com/photos/falconmotorcycles/3557161910/ http://www.flickr.com/photos/balakov/3494949386/

    ×