Tell, Don't Ask

July 19, 2012 Tagged: oop tell don't ask code Comments (View) Tell, Don’t Ask And now, a friendly message from your local Tell, don’t ask Department. Example 1 Not so good: <% if current_user.admin? %> <%= current_user.admin_welcome_message %> <% else %> <%= current_user.user_welcome_message %> <% end %> Better: <%= current_user.welcome_message %> Example 2 Not so good: def check_for_overheating(system_monitor) if system_monitor.temperature > 100 system_monitor.sound_alarms end end Better: system_monitor.check_for_overheating class SystemMonitor def check_for_overheating if temperature > 100 sound_alarms end end end Example 3 Not so good: class Post def send_to_feed if user.is_a?(TwitterUser) user.send_to_feed(contents) end end end Better: class Post def send_to_feed user.send_to_feed(contents) end end class TwitterUser def send_to_feed(contents) twitter_client.post_to_fee...

Full article: http://robots.thoughtbot.com/post/27572137956/tell-dont-ask

Tweets

@jayroh » 15 Aug '12, 8pm
Even if you don't write ruby there's a lot you could take from these 2 blog posts - [link] and [link]
@matthewlang » 12 Aug '12, 8pm
Removing conditional view logic from Journalong. Always tell, don’t ask - [link]
@lucasrenan » 30 Jul '12, 8pm
RT @vatsu: Great examples! [link] via @Ruby5
@vatsu » 30 Jul '12, 8pm
Great examples! [link] via @Ruby5
@fijiaaron » 30 Jul '12, 1pm
Great example of improving the readability of your code with OOP practices "Tell, don't ask" [link]
@gavin_morrice » 30 Jul '12, 8am
Tell, don't ask in Ruby ~ Some interesting discussion in the comments [link] #ruby #OO #programming #objectOriented #rails
@mgswolf » 27 Jul '12, 8pm
Tell, Don’t Ask [link] #Ruby #Rails #Dev
@tiagocis » 27 Jul '12, 6pm
RT @codesonic: Some little OOP hints for Ruby. Tell, Don't Ask [link]
@codesonic » 27 Jul '12, 6pm
Some little OOP hints for Ruby. Tell, Don't Ask [link]
@dhampik » 27 Jul '12, 4pm
RT @zapparov: Tell, Don't Ask - [link]
@millisami » 27 Jul '12, 8am
RT @zoraslapen: Tell, Don't Ask [link]
@mdivins » 27 Jul '12, 8am
RT @oriolgual: Tell, Don't Ask [link]
@shun » 27 Jul '12, 7am
Mountain Lion and RoR sitting on a tree…. Rubyists, before you upgrade, check it out… [link]
@a5his » 27 Jul '12, 5am
Tell, Don’t Ask [link] #rubyrails #refactoring
@rogerleite » 26 Jul '12, 2pm
RT @anderson_leite: Tell, dont ask #ruby [link]
@moonmaster9000 » 26 Jul '12, 1pm
quick tell-don't-ask examples. [link]
@mfirry » 24 Jul '12, 8pm
[link] #tell #dontask #programming #code
@stephanseufert » 24 Jul '12, 12am
RT @johanneshoffart: Tell, Don't Ask [link] - obvious in retrospect but never thought about it explicitly!
@squiddle » 22 Jul '12, 9am
the Tell, Don't Ask principle explained with some simple examples [link]
@nysalor » 22 Jul '12, 3am
後でちゃんと読む / “Tell, Don't Ask” [link]
@naoty_k » 21 Jul '12, 4pm
そうそう、こう書くようにこころがけてる。 [link]
@katgironpe » 21 Jul '12, 12pm
RT @samnangchhun: Tell, Don't Ask [link]
@iAkashz » 21 Jul '12, 7am
"Tell, Don't Ask". Surely worth reading. #Newbies [link]
@ReadySetRails » 21 Jul '12, 12am
Always code for clarity! RT @_solnic_: Here's a fantastic blog post by @r00k about "Tell Don't Ask" principle: [link]
@jugyo » 21 Jul '12, 12am
最後の例の NullAddress みたいなの、ぱっと思いつかないな [link]
@hitode909 » 21 Jul '12, 12am
RT @mori_dev: 良い記事。OOP の手本。"Tell, Don't Ask" - [link]
@mori_dev » 21 Jul '12, 12am
良い記事。OOP の手本。"Tell, Don't Ask" - [link]
@solojavier » 20 Jul '12, 11pm
Di, no preguntes // Buena practica en el desarrollo orientado a objetos [link]
@picksio » 20 Jul '12, 8pm
Tell don't Ask [link] #ruby #rails #coding #goodpractices
@j_ckao » 20 Jul '12, 8pm
Examples are simple, but definitely have their applications in large code-bases: [link]
@hassanseth » 20 Jul '12, 7pm
Tell, don't ask. #OOP #Programmng [link]
@KirinDave » 20 Jul '12, 5pm
We are now at the stage of the game where people bad engineering suggestions proudly, claiming no one else gets it: [link]
@larrywright » 20 Jul '12, 5pm
I love the Ruby community's obsession with clear, concise code: Tell, Don't Ask [link]
@ladybenko » 20 Jul '12, 4pm
RT @phpeach: A good reminder of what good OOP should be [link] via @jesperht
@phpeach » 20 Jul '12, 4pm
A good reminder of what good OOP should be [link] via @jesperht
@rapapu » 20 Jul '12, 4pm
Tell, Don’t Ask [link] | Decirle a los objetos que hacer y no invocar métodos y luego preguntar por su estado #programacion
@3zcurdia » 20 Jul '12, 3pm
RT @dfect: Tell, don't ask [link]
@chuckWnelson » 20 Jul '12, 1pm
Fantastic article on the little things when coding: Tell, Dont Ask - [link]
@herminiotorres » 20 Jul '12, 12pm
RT @NoTiLeW: Tell, Don’t Ask [link]
@spetryjohnson » 20 Jul '12, 12pm
RT @BretKoppel: Tell, Don't Ask: [link] I love it when the if/no-if crowd comes out to play. Mental cost of inheritance v. "dirty" if.
@BretKoppel » 20 Jul '12, 11am
Tell, Don't Ask: [link] I love it when the if/no-if crowd comes out to play. Mental cost of inheritance v. "dirty" if.
@neokain » 20 Jul '12, 11am
Tell, Don't Ask เหมือนเราจะทำผิดหมดเลย ความเข้าถึงเรื่องนี้ น้อยไปจริงๆ [link]
@Darum » 20 Jul '12, 10am
"Tell, don't ask" examples of code smells in Ruby: [link]
@eduhern » 20 Jul '12, 10am
RT @juanignaciosl: Unos ejemplos sencillos y claros sobre buena POO [link]
@tosbourn » 20 Jul '12, 10am
Tell, Don't Ask - some good code patterns - [link]
@_tjeden » 20 Jul '12, 9am
[link] smart examples of Tell, Don't Ask pattern, by @r00k
@brecke » 20 Jul '12, 8am
Tell, Don't Ask [link] (via Instapaper)
@daGrevis » 20 Jul '12, 7am
Tell, Don’t Ask (about OOP) [link] #kjwij
@juanignaciosl » 20 Jul '12, 7am
Unos ejemplos sencillos y claros sobre buena POO [link]
@knsmr » 20 Jul '12, 6am
if分岐はOOではpolymorphicに書き換えろという話かな。例が単純すぎるので、コメント欄での微妙な意見のズレが面白い / Tell, Don't Ask [link]

Tell, Don't Ask

Tell, Don't Ask

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