April 2012
Intermediate to advanced
296 pages
7h 3m
English
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Chapter 3Unifying Data with Sequences
Programs manipulate data. At the lowest level, programs work with structures such as strings, lists, vectors, maps, sets, and trees. At a higher level, these same data structure abstractions crop up again and again. For example:
- XML data is a tree.
- Database result sets can be viewed as lists or vectors.
- Directory hierarchies are trees.
- Files are often viewed as one big string or as a vector of lines.
In Clojure, all these data structures can be accessed through a single abstraction: the sequence (or seq).
A seq (pronounced “seek”) is a logical list. It’s logical because Clojure does not tie sequences to implementation details of a list such as a Lisp cons cell (see The Origin of Cons for the history of ...
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