clojurebook / clojureprogramming

Example projects and sample code featured in Clojure Programming (1st ed.) from O'Reilly

The official repository of sample projects and example code featured in Clojure Programming.

Please note that this repo is in flux. We have moved all of the code from the book and the sample projects over from O'Reilly's repository. The REPL interaction files for each chapter might come in handy if you are working from the print book, but still want to copy/paste code into a REPL; the projects from each chapter are self-contained examples highlighting different aspects of working with Clojure in different domains.

You can take a look at the issues on this repo to get a sense of what's left to be done. If you see any problems, by all means submit a new issue.

Of course, please feel free to watch this repo, follow @ClojureBook on Twitter, or subscribe to the book's mailing list on clojurebook.com to be notified when significant changes and improvements happen here.

License

Copyright © 2012 Chas Emerick, Brian Carper, and Christophe Grand.

Distributed under the Eclipse Public License (see included epl-v10.html), the same as Clojure.

clojureprogramming's Issues

Package up game of life implementations into a project (Chapter 3)

@cgrand, maybe you'd like to take care of this?

lein jar in ch08-lein-mixed-source fails

On commit fb44c29 of ch08-lein-mixed-source, the "lein compile" target succeeds, but the "lein jar" target fails with:

Copying 1 file to /home/clojure/src/ClojureProgramming/ch08-lein-mixed-source/lib
Compiling mixed.core
Compilation succeeded.
Compiling 1 source file to /home/clojure/src/ClojureProgramming/ch08-lein-mixed-source/classes
Exception in thread "main" java.lang.reflect.InvocationTargetException
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at jline.ConsoleRunner.main(ConsoleRunner.java:69)
Caused by: java.lang.NullPointerException (NO_SOURCE_FILE:0)
    at clojure.lang.Compiler.eval(Compiler.java:5440)
    at clojure.lang.Compiler.eval(Compiler.java:5391)
    at clojure.core$eval.invoke(core.clj:2382)
    at clojure.main$eval_opt.invoke(main.clj:235)
    at clojure.main$initialize.invoke(main.clj:254)
    at clojure.main$script_opt.invoke(main.clj:270)
    at clojure.main$main.doInvoke(main.clj:354)
    at clojure.lang.RestFn.invoke(RestFn.java:457)
    at clojure.lang.Var.invoke(Var.java:377)
    at clojure.lang.AFn.applyToHelper(AFn.java:172)
    at clojure.lang.Var.applyTo(Var.java:482)
    at clojure.main.main(main.java:37)
    ... 5 more
Caused by: java.lang.NullPointerException
    at clojure.lang.Numbers.ops(Numbers.java:1364)
    at clojure.lang.Numbers.isZero(Numbers.java:99)
    at leiningen.jar$jar.invoke(jar.clj:222)
    at leiningen.jar$jar.invoke(jar.clj:228)
    at clojure.lang.Var.invoke(Var.java:365)
    at clojure.lang.AFn.applyToHelper(AFn.java:161)
    at clojure.lang.Var.applyTo(Var.java:482)
    at clojure.core$apply.invoke(core.clj:542)
    at leiningen.core$apply_task.invoke(core.clj:264)
    at leiningen.core$_main.doInvoke(core.clj:331)
    at clojure.lang.RestFn.invoke(RestFn.java:410)
    at clojure.lang.AFn.applyToHelper(AFn.java:161)
    at clojure.lang.RestFn.applyTo(RestFn.java:132)
    at clojure.core$apply.invoke(core.clj:542)
    at leiningen.core$_main.invoke(core.clj:334)
    at user$eval42.invoke(NO_SOURCE_FILE:1)
    at clojure.lang.Compiler.eval(Compiler.java:5424)
    ... 16 more

This is with LEIN_VERSION="1.7.0"

"fixed" compare-magnitude does not really make sense

line 600 in:
https://github.com/clojurebook/ClojureProgramming/blob/master/ch03-collections-repl-interactions.clj

... it just redefines compare, using more code, and less efficiently.

Add READMEs for each project with `lein run` instructions, etc

Incorrect seq implementation in ArraySet (ch 06)

The implementation of seq for the ArraySet delegates to take, which returns an empty seq (rather than nil) when it has no items. As a result:

user=> (empty? (array-set))
false

Chapter 17 maven example doesn't include clojars, cannot resolve compojure, etc

Put an explicit license on the entire repo

Error in ``reduce`` example

On pg. 63 of the first edition there is an error in the first example for reduce:

(reduce max [0 -3 10 48])
;= 10

It should read 48.

lein jar in ch08-lein-mixed-source fails

On commit fb44c29 of ch08-lein-mixed-source, the "lein compile" target succeeds, but the "lein jar" target fails with:

Copying 1 file to /home/clojure/src/ClojureProgramming/ch08-lein-mixed-source/lib
Compiling mixed.core
Compilation succeeded.
Compiling 1 source file to /home/clojure/src/ClojureProgramming/ch08-lein-mixed-source/classes
Exception in thread "main" java.lang.reflect.InvocationTargetException
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at jline.ConsoleRunner.main(ConsoleRunner.java:69)
Caused by: java.lang.NullPointerException (NO_SOURCE_FILE:0)
    at clojure.lang.Compiler.eval(Compiler.java:5440)
    at clojure.lang.Compiler.eval(Compiler.java:5391)
    at clojure.core$eval.invoke(core.clj:2382)
    at clojure.main$eval_opt.invoke(main.clj:235)
    at clojure.main$initialize.invoke(main.clj:254)
    at clojure.main$script_opt.invoke(main.clj:270)
    at clojure.main$main.doInvoke(main.clj:354)
    at clojure.lang.RestFn.invoke(RestFn.java:457)
    at clojure.lang.Var.invoke(Var.java:377)
    at clojure.lang.AFn.applyToHelper(AFn.java:172)
    at clojure.lang.Var.applyTo(Var.java:482)
    at clojure.main.main(main.java:37)
    ... 5 more
Caused by: java.lang.NullPointerException
    at clojure.lang.Numbers.ops(Numbers.java:1364)
    at clojure.lang.Numbers.isZero(Numbers.java:99)
    at leiningen.jar$jar.invoke(jar.clj:222)
    at leiningen.jar$jar.invoke(jar.clj:228)
    at clojure.lang.Var.invoke(Var.java:365)
    at clojure.lang.AFn.applyToHelper(AFn.java:161)
    at clojure.lang.Var.applyTo(Var.java:482)
    at clojure.core$apply.invoke(core.clj:542)
    at leiningen.core$apply_task.invoke(core.clj:264)
    at leiningen.core$_main.doInvoke(core.clj:331)
    at clojure.lang.RestFn.invoke(RestFn.java:410)
    at clojure.lang.AFn.applyToHelper(AFn.java:161)
    at clojure.lang.RestFn.applyTo(RestFn.java:132)
    at clojure.core$apply.invoke(core.clj:542)
    at leiningen.core$_main.invoke(core.clj:334)
    at user$eval42.invoke(NO_SOURCE_FILE:1)
    at clojure.lang.Compiler.eval(Compiler.java:5424)
    ... 16 more

This is with LEIN_VERSION="1.7.0"

Package up maze generation impls (and Ariadne's zipper?) into a project (Chapter 3)

@cgrand, maybe you'd like to take care of this?

Package up java.jdbc and korma examples into a project(s) (Chapter 14)

The Hibernate stuff is already in place. Separate projects for java.jdbc and korma is probably warranted.

@briancarper, can you take this on?

Definition of enforce-max-health in Chapter 4

The definition of "enforce-max-health" with keyword arguments does not work with the way it is called in the definition of "character". This is an error in the book (page 190) and ch04-concurrency-repl-interactions.clj. However, the version in ch04-concurrency-game/src/com/clojurebook/concurrency/game_validators.clj is correct.