6DATA
This chapter is all about data: reading it, writing it, visualizing it, and analyzing it. We’ll begin with a discussion of input and output using Racket ports (an essential tool we’ll use throughout this chapter).
I/O, I/O, It’s Off to Work We Go
Data is transferred in Racket via ports: data flows into an input port and out of output ports. The general process of transferring data to or from an external source (such a text file or database server) is referred to as I/O. Let’s look at some examples of ports.
File I/O Ports
Ports can be used for writing and reading data to a file, as the following dialog illustrates.
> ; Output some stuff ...
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