- Land of Lisp
- Acknowledgments
- Introduction
- I. Lisp is Power
- 1. Getting Started with Lisp
- 2. Creating Your First Lisp Program
- 3. Exploring the Syntax of Lisp Code
- II. Lisp is Symmetry
- 4. Making Decisions with Conditions
- 5. Building a Text Game Engine
- 6. Interacting with the World: Reading and Printing in Lisp
- 6.5. lambda: A Function So Important It Deserves Its Own Chapter
- 7. Going Beyond Basic Lists
- 8. This Ain't Your Daddy's Wumpus
- 9. Advanced Datatypes and Generic Programming
- III. Lisp is Hacking
- 10. Looping with the loop Command
- 11. Printing Text with the format Function
- Anatomy of the format Function
- Control Sequences for Printing Lisp Values
- Control Sequences for Formatting Numbers
- Printing Multiple Lines of Output
- Justifying Output
- Iterating Through Lists Using Control Sequences
- A Crazy Formatting Trick for Creating Pretty Tables of Data
- Attack of the Robots!
- What You've Learned
- 12. Working with Streams
- 13. Let's Create a Web Server!
- 13.5. Functional Programming Is Beautiful
- IV. Lisp is Science
- 14. Ramping Lisp Up a Notch with Functional Programming
- 15. Dice of Doom, a Game Written in the Functional Style
- The Rules of Dice of Doom
- A Sample Game of Dice of Doom
- Implementing Dice of Doom, Version 1
- Defining Some Global Variables
- Representing the Game Board
- Decoupling Dice of Doom's Rules from the Rest of the Game
- Generating a Game Tree
- Calculating Passing Moves
- Calculating Attacking Moves
- Finding the Neighbors
- Attacking
- Reinforcements
- Trying Out Our New game-tree Function
- Playing Dice of Doom Against Another Human
- Creating an Intelligent Computer Opponent
- Making Dice of Doom Faster
- What You've Learned
- 16. The Magic of Lisp Macros
- 17. Domain-Specific Languages
- 18. Lazy Programming
- 19. Creating a Graphical, Web-Based Version of Dice of Doom
- 20. Making Dice of Doom More Fun
- A. Epilogue
- Index
- About the Author
- Updates
This chapter didn’t really even come close to covering all of the features of the format function. However, it did provide an introduction, in which you learned the following:
The first parameter of the
formatcommand determines whether the output is sent to the REPL, a stream, or returned as a string.The second parameter of the
formatcommand is a control string that lets you change the way your data is printed. The control string has a sophisticated syntax, acting almost like a programming language in its own right.The remaining
formatparameters are values that can be referenced from the control string to embed values into the formatted output.To embed a Lisp value into a formatted string, use the
˜sor˜acontrol sequences.Many control sequences are available for printing and customizing the appearance of numbers.
The
formatcommand also has complex looping abilities that can be used, for example, to format tables laid out in many different styles.
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