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<title>Lisp So(u)rcery · Learn Lisp The Hard Way</title>
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<ul class="summary">
<li class="header">LEARN LISP THE HARD WAY</li>
<li class="chapter " data-level="1.1" data-path="./">
<a href="index.html">
Second Draft (in-progress)
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<li class="chapter " data-level="1.2" data-path="CHANGELOG.html">
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CHANGELOG
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<li class="chapter " data-level="1.3" data-path="TODO.html">
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TODO
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<li class="header">PREFACE</li>
<li class="chapter " data-level="2.1" data-path="preface.html">
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TANSTAAFL
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<li class="chapter " data-level="2.2" data-path="preface-part-two.html">
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The Hard Way is Easier
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<li class="chapter " data-level="2.3" data-path="preface-part-three.html">
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Who Is This Book For?
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<li class="chapter " data-level="2.4" data-path="introduction.html">
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Lisp: A Future History
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<li class="chapter " data-level="2.5" data-path="acknowledgements.html">
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Acknowledgements
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</li>
<li class="header">PART ONE</li>
<li class="chapter " data-level="3.1" data-path="1-0-0-overview.html">
<a href="1-0-0-overview.html">
Grokking Lisp
</a>
<ul class="articles">
<li class="chapter " data-level="3.1.1" data-path="1-01-00-lisp-bootcamp.html">
<a href="1-01-00-lisp-bootcamp.html">
Common Lisp Bootcamp
</a>
<ul class="articles">
<li class="chapter " data-level="3.1.1.1" data-path="1-01-01-syntax-overview.html">
<a href="1-01-01-syntax-overview.html">
Syntax Overview in 5 Minutes
</a>
</li>
<li class="chapter " data-level="3.1.1.2" data-path="1-01-02-repl.html">
<a href="1-01-02-repl.html">
The REPL
</a>
</li>
<li class="chapter " data-level="3.1.1.3" data-path="1-01-03-expressions.html">
<a href="1-01-03-expressions.html">
Expressions, Parentheses, and Return Values
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</li>
<li class="chapter " data-level="3.1.1.4" data-path="1-01-04-lists-cons-cells.html">
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Lists, Cons-Cells, and Memory
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</li>
<li class="chapter " data-level="3.1.1.5" data-path="1-01-05-symbols.html">
<a href="1-01-05-symbols.html">
Symbols and Namespaces
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</li>
<li class="chapter " data-level="3.1.1.6" data-path="1-01-06-prefix-notation.html">
<a href="1-01-06-prefix-notation.html">
Prefix Notation
</a>
</li>
<li class="chapter " data-level="3.1.1.7" data-path="1-01-07-style-guide.html">
<a href="1-01-07-style-guide.html">
Common Lisp Style Guide
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</li>
<li class="chapter " data-level="3.1.1.8" data-path="1-01-08-configuration.html">
<a href="1-01-08-configuration.html">
Configuring Your Development Environment
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</li>
</ul>
</li>
<li class="chapter " data-level="3.1.2" data-path="1-02-00-input-output.html">
<a href="1-02-00-input-output.html">
Printing, Streams, and Strings
</a>
<ul class="articles">
<li class="chapter " data-level="3.1.2.1" data-path="1-02-01-strings.html">
<a href="1-02-01-strings.html">
Strings
</a>
</li>
<li class="chapter " data-level="3.1.2.2" data-path="1-02-02-more-strings.html">
<a href="1-02-02-more-strings.html">
More Strings
</a>
</li>
<li class="chapter " data-level="3.1.2.3" data-path="1-02-03-unicode.html">
<a href="1-02-03-unicode.html">
Unicode and Strings
</a>
</li>
<li class="chapter " data-level="3.1.2.4" data-path="1-02-04-chars.html">
<a href="1-02-04-chars.html">
Characters
</a>
</li>
<li class="chapter " data-level="3.1.2.5" data-path="1-02-05-more-chars.html">
<a href="1-02-05-more-chars.html">
More Characters
</a>
</li>
<li class="chapter " data-level="3.1.2.6" data-path="1-02-06-char-codes.html">
<a href="1-02-06-char-codes.html">
Character Codes
</a>
</li>
<li class="chapter " data-level="3.1.2.7" data-path="1-02-07-strings-from-chars.html">
<a href="1-02-07-strings-from-chars.html">
Strings from Chars
</a>
</li>
<li class="chapter " data-level="3.1.2.8" data-path="1-02-08-printing.html">
<a href="1-02-08-printing.html">
Printing
</a>
</li>
<li class="chapter " data-level="3.1.2.9" data-path="1-02-09-more-printing.html">
<a href="1-02-09-more-printing.html">
More Printing
</a>
</li>
<li class="chapter " data-level="3.1.2.10" data-path="1-02-10-prin1.html">
<a href="1-02-10-prin1.html">
Printing With prin1
</a>
</li>
<li class="chapter " data-level="3.1.2.11" data-path="1-02-11-princ.html">
<a href="1-02-11-princ.html">
Printing With princ
</a>
</li>
<li class="chapter " data-level="3.1.2.12" data-path="1-02-12-format.html">
<a href="1-02-12-format.html">
A Brief Introduction to Format
</a>
</li>
<li class="chapter " data-level="3.1.2.13" data-path="1-02-13-more-format.html">
<a href="1-02-13-more-format.html">
A Little Bit More on Format
</a>
</li>
<li class="chapter " data-level="3.1.2.14" data-path="1-02-14-pathnames.html">
<a href="1-02-14-pathnames.html">
Pathnames
</a>
</li>
<li class="chapter " data-level="3.1.2.15" data-path="1-02-15-streams.html">
<a href="1-02-15-streams.html">
Streams
</a>
</li>
<li class="chapter " data-level="3.1.2.16" data-path="1-02-16-file-streams.html">
<a href="1-02-16-file-streams.html">
File Streams
</a>
</li>
<li class="chapter " data-level="3.1.2.17" data-path="1-02-17-binary-streams.html">
<a href="1-02-17-binary-streams.html">
Binary Streams
</a>
</li>
<li class="chapter " data-level="3.1.2.18" data-path="1-02-18-prompting-users.html">
<a href="1-02-18-prompting-users.html">
Prompting Users
</a>
</li>
<li class="chapter " data-level="3.1.2.19" data-path="1-02-19-pretty-printing.html">
<a href="1-02-19-pretty-printing.html">
Pretty-Printing
</a>
</li>
</ul>
</li>
<li class="chapter " data-level="3.1.3" data-path="1-03-0-getting-input-from-users.html">
<a href="1-03-0-getting-input-from-users.html">
Extra Credit: Getting Input from Users
</a>
</li>
<li class="chapter " data-level="3.1.4" data-path="1-04-0-lists.html">
<a href="1-04-0-lists.html">
Lists and List-Operations
</a>
</li>
<li class="chapter " data-level="3.1.5" data-path="1-05-0-lookups-trees.html">
<a href="1-05-0-lookups-trees.html">
Extra Credit: Look-up Lists and Trees
</a>
</li>
<li class="chapter " data-level="3.1.6" data-path="1-06-0-math.html">
<a href="1-06-0-math.html">
Numbers and Math
</a>
<ul class="articles">
<li class="chapter " data-level="3.1.6.1" data-path="1-06-01-integers.html">
<a href="1-06-01-integers.html">
Integers
</a>
</li>
<li class="chapter " data-level="3.1.6.2" data-path="1-06-02-more-integers.html">
<a href="1-06-02-more-integers.html">
More Integers
</a>
</li>
<li class="chapter " data-level="3.1.6.3" data-path="1-06-03-hexadecimal-notation.html">
<a href="1-06-03-hexadecimal-notation.html">
Hexadecimal Integer Notation
</a>
</li>
<li class="chapter " data-level="3.1.6.4" data-path="1-06-04-octal-notation.html">
<a href="1-06-04-octal-notation.html">
Octal Integer Notation
</a>
</li>
<li class="chapter " data-level="3.1.6.5" data-path="1-06-05-binary-notation.html">
<a href="1-06-05-binary-notation.html">
Binary Integer Notation
</a>
</li>
<li class="chapter " data-level="3.1.6.6" data-path="1-06-06-ratios.html">
<a href="1-06-06-ratios.html">
Ratios and Rational Numbers
</a>
</li>
<li class="chapter " data-level="3.1.6.7" data-path="1-06-07-floating-point.html">
<a href="1-06-07-floating-point.html">
Floating-point Numbers
</a>
</li>
<li class="chapter " data-level="3.1.6.8" data-path="1-06-08-constants.html">
<a href="1-06-08-constants.html">
Numeric Constants
</a>
</li>
<li class="chapter " data-level="3.1.6.9" data-path="1-06-09-complex-numbers.html">
<a href="1-06-09-complex-numbers.html">
Complex Numbers
</a>
</li>
<li class="chapter " data-level="3.1.6.10" data-path="1-06-10-arithmetic.html">
<a href="1-06-10-arithmetic.html">
Arithmetic
</a>
</li>
<li class="chapter " data-level="3.1.6.11" data-path="1-06-11-more-arithmetic.html">
<a href="1-06-11-more-arithmetic.html">
More Arithmetic
</a>
</li>
<li class="chapter " data-level="3.1.6.12" data-path="1-06-12-even-more-arithmetic.html">
<a href="1-06-12-even-more-arithmetic.html">
Even More Arithmetic
</a>
</li>
<li class="chapter " data-level="3.1.6.13" data-path="1-06-13-exponents.html">
<a href="1-06-13-exponents.html">
Exponents
</a>
</li>
<li class="chapter " data-level="3.1.6.14" data-path="1-06-14-logarithms.html">
<a href="1-06-14-logarithms.html">
Logarithms
</a>
</li>
<li class="chapter " data-level="3.1.6.15" data-path="1-06-15-trigonometry.html">
<a href="1-06-15-trigonometry.html">
Trigonometry
</a>
</li>
<li class="chapter " data-level="3.1.6.16" data-path="1-06-16-psuedorandom-numbers.html">
<a href="1-06-16-psuedorandom-numbers.html">
Pseudo-Random Numbers
</a>
</li>
</ul>
</li>
<li class="chapter " data-level="3.1.7" data-path="1-07-0-arrays.html">
<a href="1-07-0-arrays.html">
Extra Credit: Arrays and Vectors
</a>
</li>
<li class="chapter " data-level="3.1.8" data-path="1-08-0-variables.html">
<a href="1-08-0-variables.html">
Variables, Parameters, and Constants
</a>
</li>
<li class="chapter " data-level="3.1.9" data-path="1-09-0-closures.html">
<a href="1-09-0-closures.html">
Extra Credit: Closures
</a>
</li>
<li class="chapter " data-level="3.1.10" data-path="1-10-0-functions.html">
<a href="1-10-0-functions.html">
Functions and Macros
</a>
</li>
<li class="chapter " data-level="3.1.11" data-path="1-11-0-text-adventure.html">
<a href="1-11-0-text-adventure.html">
Extra Credit: A Simple Text Adventure
</a>
</li>
<li class="chapter " data-level="3.1.12" data-path="1-12-0-namespaces.html">
<a href="1-12-0-namespaces.html">
Namespaces, Symbols, Packages, and Systems
</a>
</li>
<li class="chapter " data-level="3.1.13" data-path="1-13-0-simple-web-app.html">
<a href="1-13-0-simple-web-app.html">
Extra Credit: A Simple Web Application
</a>
</li>
<li class="chapter " data-level="3.1.14" data-path="1-14-0-conditionals.html">
<a href="1-14-0-conditionals.html">
Conditionals
</a>
</li>
<li class="chapter " data-level="3.1.15" data-path="1-15-0-command-line-utility.html">
<a href="1-15-0-command-line-utility.html">
Extra Credit: Command-Line Utilities
</a>
</li>
<li class="chapter " data-level="3.1.16" data-path="1-16-0-map-loop.html">
<a href="1-16-0-map-loop.html">
Mapping and Looping
</a>
</li>
<li class="chapter " data-level="3.1.17" data-path="1-17-0-iterate.html">
<a href="1-17-0-iterate.html">
Extra Credit: Revisiting Loops with Iterate
</a>
</li>
<li class="chapter " data-level="3.1.18" data-path="1-18-0-format.html">
<a href="1-18-0-format.html">
Format Strings
</a>
</li>
<li class="chapter " data-level="3.1.19" data-path="1-19-0-dsl.html">
<a href="1-19-0-dsl.html">
Extra Credit: Domain Specific Languages
</a>
</li>
<li class="chapter " data-level="3.1.20" data-path="1-20-0-review.html">
<a href="1-20-0-review.html">
Part One in Review
</a>
</li>
</ul>
</li>
<li class="header">PART TWO</li>
<li class="chapter " data-level="4.1" data-path="2-0-0-overview.html">
<a href="2-0-0-overview.html">
The Suffusion of Blue
</a>
<ul class="articles">
<li class="chapter " data-level="4.1.1" data-path="2-01-0-programming-paradigms.html">
<a href="2-01-0-programming-paradigms.html">
Programming Paradigms
</a>
</li>
<li class="chapter " data-level="4.1.2" data-path="2-02-0-regex.html">
<a href="2-02-0-regex.html">
Extra Credit: Regular Expressions
</a>
</li>
<li class="chapter " data-level="4.1.3" data-path="2-03-0-objects-control.html">
<a href="2-03-0-objects-control.html">
Objects and Control Structures
</a>
</li>
<li class="chapter " data-level="4.1.4" data-path="2-04-0-data-persistence.html">
<a href="2-04-0-data-persistence.html">
Extra Credit: Persistence and Databases
</a>
</li>
<li class="chapter " data-level="4.1.5" data-path="2-05-0-extended-types.html">
<a href="2-05-0-extended-types.html">
Extended Types
</a>
</li>
<li class="chapter " data-level="4.1.6" data-path="2-06-0-threads-memos-parallel.html">
<a href="2-06-0-threads-memos-parallel.html">
Extra Credit: Concurrency and Memoization
</a>
</li>
<li class="chapter " data-level="4.1.7" data-path="2-07-0-logic-and-more-math.html">
<a href="2-07-0-logic-and-more-math.html">
Logic and Advanced Math
</a>
</li>
<li class="chapter " data-level="4.1.8" data-path="2-08-0-number-theory.html">
<a href="2-08-0-number-theory.html">
Extra Credit: Number Theory
</a>
</li>
<li class="chapter " data-level="4.1.9" data-path="2-09-0-binary-octets-bits.html">
<a href="2-09-0-binary-octets-bits.html">
Binary Streams, Octet-Vectors, and Bit-Vectors
</a>
</li>
<li class="chapter " data-level="4.1.10" data-path="2-10-0-improved-text-adventure-engine.html">
<a href="2-10-0-improved-text-adventure-engine.html">
Extra Credit: An Improved Text Adventure Engine
</a>
</li>
<li class="chapter " data-level="4.1.11" data-path="2-11-0-conditions.html">
<a href="2-11-0-conditions.html">
Conditions and Error Handling
</a>
</li>
<li class="chapter " data-level="4.1.12" data-path="2-12-0-2d-game.html">
<a href="2-12-0-2d-game.html">
Extra Credit: Write a 2D Game
</a>
</li>
<li class="chapter " data-level="4.1.13" data-path="2-13-0-compiler.html">
<a href="2-13-0-compiler.html">
The Compiler
</a>
</li>
<li class="chapter " data-level="4.1.14" data-path="2-14-0-tree-shaker.html">
<a href="2-14-0-tree-shaker.html">
Extra Credit: Write a Tree-Shaker
</a>
</li>
<li class="chapter " data-level="4.1.15" data-path="2-15-0-docs-and-inspection.html">
<a href="2-15-0-docs-and-inspection.html">
Documentation and Inspection
</a>
</li>
<li class="chapter " data-level="4.1.16" data-path="2-16-0-foreign-libs.html">
<a href="2-16-0-foreign-libs.html">
Extra Credit: Foreign Libraries in Lisp
</a>
</li>
<li class="chapter " data-level="4.1.17" data-path="2-17-0-debugging-testing.html">
<a href="2-17-0-debugging-testing.html">
Debugging and Unit Testing
</a>
</li>
<li class="chapter " data-level="4.1.18" data-path="2-18-0-ffi.html">
<a href="2-18-0-ffi.html">
Extra Credit: Write a Foreign Function Interface
</a>
</li>
<li class="chapter " data-level="4.1.19" data-path="2-19-0-essential-libs.html">
<a href="2-19-0-essential-libs.html">
Essential Lisp Libraries
</a>
</li>
<li class="chapter " data-level="4.1.20" data-path="2-20-0-packaging-libs.html">
<a href="2-20-0-packaging-libs.html">
Extra Credit: Packaging Lisp Libraries
</a>
</li>
<li class="chapter " data-level="4.1.21" data-path="2-21-0-review.html">
<a href="2-21-0-review.html">
Detailed Syntax Review
</a>
</li>
</ul>
</li>
<li class="header">PART THREE</li>
<li class="chapter active" data-level="5.1" data-path="3-00-00-overview.html">
<a href="3-00-00-overview.html">
Lisp So(u)rcery
</a>
<ul class="articles">
<li class="chapter " data-level="5.1.1" data-path="3-01-00-web-apps.html">
<a href="3-01-00-web-apps.html">
Real-world Web Apps
</a>
</li>
<li class="chapter " data-level="5.1.2" data-path="3-02-00-typesetting.html">
<a href="3-02-00-typesetting.html">
Typesetting
</a>
</li>
<li class="chapter " data-level="5.1.3" data-path="3-03-00-mobile.html">
<a href="3-03-00-mobile.html">
Native Mobile Applications
</a>
</li>
<li class="chapter " data-level="5.1.4" data-path="3-04-00-gui.html">
<a href="3-04-00-gui.html">
Cross-platform Desktop Applications
</a>
</li>
<li class="chapter " data-level="5.1.5" data-path="3-05-00-system-utils.html">
<a href="3-05-00-system-utils.html">
Drivers, Daemons, and System-Utilities
</a>
</li>
<li class="chapter " data-level="5.1.6" data-path="3-06-00-reverse-engineering.html">
<a href="3-06-00-reverse-engineering.html">
Reverse Engineering
</a>
</li>
<li class="chapter " data-level="5.1.7" data-path="3-07-00-graphics.html">
<a href="3-07-00-graphics.html">
Graphics Rendering
</a>
</li>
<li class="chapter " data-level="5.1.8" data-path="3-08-00-gaming.html">
<a href="3-08-00-gaming.html">
OpenGL, SDL, and 3D Game Development
</a>
</li>
<li class="chapter " data-level="5.1.9" data-path="3-09-00-audio.html">
<a href="3-09-00-audio.html">
Audio Generation and Manipulation
</a>
</li>
<li class="chapter " data-level="5.1.10" data-path="3-10-00-data.html">
<a href="3-10-00-data.html">
Data Aggregation and Analysis
</a>
</li>
<li class="chapter " data-level="5.1.11" data-path="3-11-00-cryptosec.html">
<a href="3-11-00-cryptosec.html">
Cryptography and Security
</a>
</li>
<li class="chapter " data-level="5.1.12" data-path="3-12-00-fintech.html">
<a href="3-12-00-fintech.html">
Financial Software and Crypto-Currencies
</a>
</li>
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Space Tech
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Neuroscience and Thought-Controlled Computing
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A Simple LispOS
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Build Your Own Lisp Machine
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Government and Military Grade Systems
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<h1 id="part-three">PART THREE</h1>
<h2 id="lisp-sourcery">Lisp So(u)rcery</h2>
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<p>&quot;I would be disappointed if everything I saw turned out to be something Western Electric will build once Bell Labs works the bugs out. There ought to be some magic, somewhere, just for flavor.&quot;</p>
<footer>Robert A. Heinlein, <em>Glory Road</em></footer>
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<p>Now that you&apos;ve gotten a solid grounding in the Common Lisp language and some popular Lisp libraries, it&apos;s time to really challenge yourself. While up to this point, Extra Credit exercises have been mixed in-between fundamental language exercises, this part of the book is all practical exercises. It will guide you through many of the popular use-cases you will come across as a professional Lisp developer, and by the end of it, you will be able to work some real programming magic.</p>
<p>This part of the book will also be less prescriptive, and leave you to rely on your knowledge and instinct to complete the outlined projects. I will guide you through system architecture, laying out a project into user stories, and finding relevant libraries which can save you time; but I&apos;m leaving the coding to you. When you complete each chapter, you can then compare your implementation against my own reference implementation and those of your peers. But remember, no cheating! It&apos;s important that you finish the project on your own and get it to run with only the information I&apos;ve given you, before looking for alternate implementations to improve your style or methodology.</p>
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