Web Development with Clojure, 2nd Edition

Data Types

Clojure provides a number of data types, most of which are unsurprising:

• Vars provide mutable storage locations. These can be bound and rebound on a per-thread basis.

• Booleans can have a value of true or false; nil values are also treated as false.

• Numbers can be integers, doubles, floats, or fractions.

• Symbols are used as identifiers for variables.

• Keywords are symbols that reference themselves and are denoted by a colon; these are often used as keys in maps.

• Strings are denoted by double quotes and can span multiple lines.

• Characters are denoted by a preceding backslash.

• Regular expressions are strings prefixed with a hash symbol.

In addition to the data types, Clojure provides a rich set of standard collections. These include ...