+Built-In Datatypes in The Racket Guide introduces Datatypes.
Each pre-defined datatype comes with a set of procedures for manipulating instances of the datatype.
4.1Equality
4.2Booleans
4.3Numbers
4.4Strings
4.5Byte Strings
4.6Characters
4.7Symbols
4.8Regular Expressions
4.9Keywords
4.10Pairs and Lists
4.11Mutable Pairs and Lists
4.12Vectors
4.13Stencil Vectors
4.14Boxes
4.15Hash Tables
4.16Treelists
4.17Sequences and Streams
4.18Dictionaries
4.19Sets
4.20Procedures
4.21Void
4.22Undefined
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