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Wow, this is totally fantastic, and remarkably simple. Props.

Awesome hack! I just played around with it for a bit, and it’s like Symbol#to_proc on steroids—well done!

That’s so sexy. I’ve wanted to be able to do this since day one. Again, NICE.

Some cool meta programming, for sure.

One possible improvement: I think you can add respond_to? to the undef_method line, and then get rid of the condition in method missing.

One thing I should point out though, as of 1.9 it may be easier just to define “it” in Enumerator. Than we’d have a fluent (ie. magic-dot) interface:

User.find(:all).map.its.contacts.map.its.last_name.capitalize

Make you want alias #its as #his, #her and #their too ;-)

I like this technique. Good job.

Addendum: Nat also posted about an updated syntax for higher-order messages here: http://nat.truemesh.com/archives/000538.html

Neat. I like it, more understandable than symbol to_proc.

Premature optimization and all that, but seems to be about the same speed as symbol to proc, albeit both are quite a bit slower than the good old fashioned blocks…

>> Benchmark.bm do |b|
?>   b.report('normal') { n.times { (1..100).select { |i| i.size } } }
>>   b.report('method') { n.times { (1..100).select &it.size } }
>>   b.report('toproc') { n.times { (1..100).select(&:size)  }  }
>> end
      user     system      total        real
normal  0.090000   0.000000   0.090000 (  0.093936)
method  0.490000   0.000000   0.490000 (  0.499792)
toproc  0.460000   0.000000   0.460000 (  0.474050)

Great technique, but does it run like a dog as Symbol#to_proc does?

I’ve been thinking about the same problem as well. But my approach was to attack the “chained method calls” instead – as described at: http://www.gnejs.net/2007/04/18/arrayto_proc-nested-properties-for-to_proc-hack/

The example above would be implemented as: User.find(:all).map(&[:last_name, :capitalize])

Your variant is more dynamic and more readable though smile.

I posted a slight improvement to Methodphitamine on my blog. Long story short, I add respond_to? to the list of methods to keep around, which lets you take out the hack in method_missing to detect it being called.

It should be marginally faster, too, since it avoids one more call to method_missing.

Otherwise, a great hack!

Dude, you combined two of my favorite things: speed and Ruby.

Seriously, I love speed. Dextros, rits, adderall, and yes the old standbys coke and meth. Not so much meth though, that shit can get ugly.

Anyway, like speed, I just can’t get Ruby*. Meaning, I like to talk about it as my favorite language and how it it so much better than the others and what have you, and I bought all the books: Pickaxe, AWDROR, (goddammit I can’t tell you how many time’s I’ve written that abbreviation. mostly from copying the pdf of the book from computer to computer in the hopes that it would actually be used—negative.), Everyday Scripting with Ruby, etc, but when it comes down to it, i realize that if you add up all the time i actually spend sitting down and doing some REAL FUCKING WORK with it, it probably would equal, I don’t know, 2 hours in the past 4 years.

What is my problem? Is it that I don’t have an actual use for Ruby in Real Life? That’s bullshit. I could think of 15 things right now I could be using Ruby for. Am I holding out for another programming language? Don’t think so… Like I said it’s been 4 years and I am still holding onto Ruby as my language of choice even though I have not written A SINGLE FUCKING RUBY PROGRAM OF MY OWN. Not one—they all come from the canned examples of Messrs. Thomas, et al.

I know the answer, and you probably do too after reading this. It’s that I have no attention span. Zero. I get enamored with a project and go full-throttle, balls-out for, I don’t know 23 SECONDS and then find a new, cooler, shinier thing to play with.

You want to talk about text editors? I swear to Christ, one day I had one giant boner after another during a “OK, this will decide which text editor I will use from now until forever” moment. Typing “text editor” into Google was a bad idea—bad like when I decided to do lines of coke before a family reunion. One editor was based on wxWidgets, which required me to download the wxWidgets library and oooh, Ruby has wxWidgets bindings! Hold that though while I go try to make a BLANK CANVAS WITH A TITLEBAR THAT SAYS HELLO WORLD, WONT THAT BE THE BALLS. But wait, WTF am I going to use to input this awesome as fuck application? I need a cool as ass text editor to do it! Also, I heard on some mailing list that Ruby-GTK is the wave of the future, so fuck this wxWidgets shit and bring me the head honcho of that department! Hmmm, GTK, that sounds like Linux. Maybe I should just install Linux if I am going to fuck around with graphics toolkits. Ubuntu looks like pretty easy but I’ll be shit if SuSE didn’t have a kick-assier theme. Wait a minute, Cygwin, you can run UNIX on Windows? That is so awesome I want to have babies with it. Oooooh, Emacs? Should I learn the beast? I saw a screencast with some guy doing things with Rails projects in Emacs that make the TextMate guys lower their heads in shame. Ruby-Vim, though, look at it, it’s like the fucking editor was made for the language. You and the language become one, the binding energy of your fantastical thought process will balance the cosmos with beautiful code AND it will take less keystrokes.

Beautiful code? Oh you must mean HAML. That shit is so baller that I want to kiss that Hampton Camptown races guy for creating the Haiku shit. The name of the language is like his name! I WANT VERITABLE HAIKU. I HAVE NO IDEA WHAT THAT MEANS BUT I WANT IT. But what about DRYML? That Hobo guy is no slouch either. He is, like, British and shit. And I went through the screencasts—all of them—and was impressed beyond belief. Then the AjaxScaffold project finds its way into my browser and it is all over. Fucking Ajax. I want to make the boxes appear out of nowhere. I want to flash the screen, without Flash. I want. I WANT. WHERE THE FUCK DO I START. Where will it end? It won’t.

Do you see what kind of person you are all dealing with here? I am spilling out my heart and soul about the epic internal struggle I am having because I SAW A WORD THAT LOOKS LIKE A DRUG I LIKE. I am a passionate person. I have passion. I also have an addictive personality, and I am also excitable. Those don’t mix well. Excitable is a loud bang and then a whimper. Drugs is the same.

I have no discipline. None. How I got where I am being the way I am is a complete, albeit fortunate, mystery. So I guess for some things, these personality-lifestyle choices don’t have to be mutually exclusive. I have a good job which I excel at, nice place, mostly non-skeevy friends. I think I might have to let this Ruby thing go and realize I was not cut out for such things.

Anyway, thanks for listening everyone. Good luck with the library or module or whatever the hell they call it in Ruby land. Don’t even get me started about a Proc. I sat down one day after reading about how Proc will make me more productive, streamline my code, save starving children, and cure Polio. It ended up being a COMPLETE AND UTTER MINDFUCK. I could not wrap my brain around this concept, no matter how hard I tried. I firmly believe that I tried so hard to learn this that a singularity developed in my brain that began collapsing in on itself. Had I not found something else to distract me, you all may have not been here to read this due to the black hole that was created as a result, destroying the universe and more importantly me still not knowing what the fuck a Proc is. You’re welcome.

• By “can’t get” in the context of speed, I mean I can’t acquire it very easily, which is a good thing since I probably would be dead right now if it were easy.

Simple and efficient, the Ruby way. Great !

If you think your way is more readable than the usual Ruby way, you’re insane.

lester bangs: LOL! That was the funniest junkie gibberish I’ve read in a while.

Simply Awesome !!

w000t!!!

lester bangs deserves their own show, seriously

This is the guy we should have writing Ruby books.

it was pretty annoying that symbol#to_proc didn’t support any arguments or anything. and it’s quite cool that this word choice doesn’t hurt rspec’s feelings. i still think logic is a more appropriate culprit than magic. the one thing is if its that much of a performance hit, be careful with adhearsion because that library is going to be used billions of times.

Using Dr. Nic’s map_by_method gem I think this is prettier:

User.find(:all).map_by_contacts.map_by_last_name.map_by_capitalize

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