Just getting back to this thread... looks like there's been some good
discussion.
One thing that hasn't been mentioned yet, and which unfortunately I
couldn't really address in the talk without a long tangent, is *why *would
you want to write code like this in the first place? Is a proc in a case
statement anything but a useless, overly-clever bit of language esoterica?
In the describe_color example from the slides, it really is kind of
overkill. I wouldn't recommend actually writing code like that instead of
using if color.blueish?...elsif color.reddish?...etc.
Where it's more useful is when you parameterise the case statement by
passing a variable that contains a proc. I'm having a hard time thinking of
a good, concise example of that, but maybe someone else has one.
On Friday, August 1, 2014 6:01:46 PM UTC+10, Marky Mark wrote:
>
> Um, I just wrote my original question out and stared at it some more and
> realised it was a stupid question to begin with :-(
>
> But the more I think about it the more I'm confused (and maybe this is
> where hearing what Tim said at the time would help).
>
> Conceptually I see "case a when b ... when c ... else ..." as being the
> same as "if a === b ... elsif a === c ... else ..." (as indeed slides 67-69
> show) but that seems to fail for slide 62's use of proc:
>
> case color
> when proc { |color| color.more_blue? }
> "blueish"
>
> because comparing color with what the proc yields (true or false) surely
> doesn't work. Am I misunderstanding what proc yields?
>
> On Friday, August 1, 2014 5:08:06 PM UTC+10, Dave Burt wrote:
>>
>> Thanks for the notes, Tim!
>>
>> Mark, post your case questions here!
>>
>> On the same topic, here is an article by Why on another feature of Ruby's
>> case statements: you can *splat* an array like this:
>>
>> foo = 3
>> ARRAY = [/abc/, Hash, 1..5]
>> case foo; when *ARRAY; 'included'; else "doesn't === anything in the
>> array"; end
>>
>> http://viewsourcecode.org/why/redhanded/bits/wonderOfTheWhenBeFlat.html
>>
>> Cheers,
>> Dave
>>
>>
>> On Fri, Aug 1, 2014 at 2:53 PM, Marky Mark <[email protected]> wrote:
>>
>>> Just slides though, no soundtrack? Familiar with case statements as I am
>>> in general, I can't help thinking I'm missing a little of the
>>> subtlety/reasoning w.r.t Ruby. I do have one or two stupid questions.
>>> Should I post here or ask you privately?
>>>
>>>
>>> On Thursday, July 31, 2014 3:04:32 PM UTC+10, Tim Moore wrote:
>>>>
>>>> Yes, I'll echo Dave's thoughts: thanks to the organisers and the
>>>> substitute host!
>>>>
>>>> My slides are up at https://speakerdeck.com/
>>>> timmoore/rubys-magical-case-statement and http://www.slideshare.net/
>>>> timothymoore/rubys-magical-case-statement (take your pick)
>>>>
>>>> On Thursday, July 31, 2014 8:52:42 AM UTC+10, Dave Burt wrote:
>>>>>
>>>>> Hi,
>>>>>
>>>>> Thanks to the organisers and speakers for another great evening.
>>>>>
>>>>> May I ask again for links to any of the talks that are available?
>>>>>
>>>>> I think Duncan referenced his Github repo https://github.com/
>>>>> duncan-bayne/presentations
>>>>>
>>>>> Cheers,
>>>>> Dave
>>>>>
>>>>>
>>>>> On Fri, Jul 25, 2014 at 1:17 PM, Mario Visic <[email protected]>
>>>>> wrote:
>>>>>
>>>>>> Hi All
>>>>>>
>>>>>> The Melbourne Ruby meet will be happening next wednesday evening (the
>>>>>> 30th July), with our usual array of entertaining talks, delicious food,
>>>>>> tasty beverages, and delightful company (that’s you!).
>>>>>>
>>>>>> WHEN: Wednesday 30th July, arrive at 6pm for a 6:30pm start,
>>>>>> wrapping up around 9pm.
>>>>>> WHERE: Inspire9, Level 1, 41-43 Stewart Street
>>>>>> WHAT: Three speakers, plus socialising, good food (not pizza) and
>>>>>> drinks.
>>>>>>
>>>>>> Our line-up this month is:
>>>>>> Jordan Lewis + Luke Arndt - Styleguide driven development
>>>>>> Duncan Bayne - There’s no such thing as magic - tools and techniques
>>>>>> for Ruby developers
>>>>>> Tim Moore - Case Statements and ===
>>>>>>
>>>>>> All of these details are repeated on Meetup, for those who prefer
>>>>>> that as their source of event information:
>>>>>> http://www.meetup.com/Ruby-On-Rails-Oceania-Melbourne/
>>>>>> events/175705562/
>>>>>>
>>>>>> Yet again, food is sponsored by Envato, Lookahead Search and
>>>>>> Redbubble, the drinks by Zendesk, and the space by Inspire9.
>>>>>>
>>>>>> If you've any questions or thoughts, get in touch - we're looking
>>>>>> forward to seeing you all there :)
>>>>>>
>>>>>> --
>>>>>> Mario & Pat
>>>>>>
>>>>>> --
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>>>>>> For more options, visit https://groups.google.com/d/optout.
>>>>>>
>>>>>
>>>>> --
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>>
>>
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