January 2017
Intermediate to advanced
565 pages
13h 46m
English
Content preview from Clojure: High Performance JVM ProgrammingBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Persistent collections
One of the most important features in Clojure is that collections are persistent. That does not mean that they are persistent to disk, it means that you can have several historical versions of a collection with the guarantee that updating or looking for something in any of those versions is going to have the same effort (complexity). You get all this with very little extra memory.
How? It is actually pretty simple. Clojure shares a common structure between several different data structures. If you add a single element to a data structure, Clojure shares the common part between the two structures and keeps track of the differences.
Let's see what we mean with an example:
(def sample-coll [:one :two :three]) (def second-sample-coll ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.