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I want to thank everybody for coming. [br]The title of this talk is Clojure, Made Simple.

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On the brochure, they left out the comma. [br]So it's not "Clojure made simple"

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In other words, a tutorial on Clojure, [br]or an easy explanation of Clojure.

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It's not actually a comprehensive explanation of Clojure at all.[br]But I'll look at a slice of what Clojure's about.

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And a way of thinking about why you might want to use it.

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So, I am the person who made Clojure.[br]I currently work on a database called Datomic,

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which is kind of a functional database. It was written in Clojure, it runs on JVM architecture.

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I'm a co-founder of Cognitect, which builds Datomic[br]and sponsors the development

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and stewardship of Clojure.[br]But the main point I wanted to make about myself

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to this audience was because in this talk I might[br]seem somewhat skeptical of Java and

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object-oriented programming, is that I've done and absolute ton of that.

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That's what I did for two decades before I said, 'if I still[br]want to be a programmer, I don't want to do it

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this way anymore.'[br]So I know exactly how apps are built using Java

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and C++ and C# because that's what I used to do.

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That doesn't mean that what I think about them is correct,[br]but that's my experience.

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But I'm wondering about you.[br]How many people program in Java here?

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How many people are happy about that?[br]How many people are actively unhappy about that?

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I'm looking for alternatives.[br][laughter]

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Okay, great. How many people have tried Clojure at all?

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Ok, great. How many people have never heard of Clojure and are in the wrong room?

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[laughter]

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How many people have tried Clojure and are trying to get to use it at work, but not yet? A few.

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Maybe this talk will give you some ways of talking about Clojure's value proposition that could help you.

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How many people actively use Clojure?[br]and somehow are accidentally at JavaOne?

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[laughter][br]Okay, and the rest couldn't get into Brian Goetz's talk.

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I shouldn't even mention that Brian Goetz has a talk [br]right now, because we're going to have people

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filing out. Or maybe you're just tired of[br]Brian Goetz talking about immutability.

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In which case, you're definitely in the wrong room.[br][laughter]

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No, I like him. Brian's a good friend. And his talks are great.[br]So I appreciate your being in this one.

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So, there were very few people who had never[br]heard of Clojure. So I'm not going to

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spend a lot of time on it.[br]Oh, I had one more question:

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How many people have talk, "Simple Made Easy?"[br]How many people have not?

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Okay, a few. So, I may spend a minute describing what[br]I mean when I say 'simple.'

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Clojure is a programming language[br]that runs on the JVM and JavaScript.

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And a substantial subset of Clojure runs on JavaScript.[br]So it's a programming language with which

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you can target both.[br]But originally it only targeted the JVM and the CLR.

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There's still a port to the CLR that's maintained, [br]but it does not see wide use.

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I released it first in 2007. It's had surprising adoption.[br]Especially from my perspective since then,

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given its characteristics. Because it's a lisp,[br]it's functional, it's data-oriented,

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and it has a lot of things that make it seem[br]not like the kind of language that would succeed.

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And this talk will really be about the data-orientation of Clojure.

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So, a lot of the best programmers, and the most productive programmers I know are writing everything in blank

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and swearing by it, and then just producing ridiculously sophisticated things in a very short time.

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And that programmer productivity matters.[br]So Adrian Cockcroft was Cloud Architect at Netflix.

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Now he's at Battery Ventures.[br]How many people think Java goes in the blank?

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Okay. So we know, we know this.[br]There's something about Java that makes it

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not suitable for this blank.