Clojure: High Performance JVM Programming

Thinking in sequences

A sequence, shortened as a seq, is essentially an abstraction of a list. This abstraction provides a unified model or interface to interact with a collection of items. In Clojure, all the primitive data structures, namely strings, lists, vectors, maps, and sets can be treated as sequences. In practice, almost everything that involves iteration can be translated into a sequence of computations. A collection is termed as seqable if it implements the abstraction of a sequence. We will learn everything there is to know about sequences in this section.

Sequences can also be lazy. A lazy sequence can be thought of as a possibly infinite series of computed values. The computation of each value is deferred until it is actually needed. ...