Chapter 12. Working with Streams
Nearly every computer program you write will need to interact with the outside world at some point. Perhaps your program just needs to communicate with the user through the REPL, printing out information and capturing the user’s input from the keyboard. Other programs you write may need to read or write files on a hard drive. Additionally, you may want to write programs that interact with other computers, either over a local network or the Internet. In Common Lisp, these kinds of interactions happen through streams.
Streams are data types in Common Lisp that allow you to take some external resource and make it look like just another simple piece of data you can manipulate with your code. The external resource could ...
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