September 2015
Intermediate to advanced
198 pages
4h 52m
English
Content preview from Clojure High Performance Programming - Second EditionBecome 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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Numerics, boxing, and primitives
Numerics are scalars. The discussion on numerics was deferred till this chapter for the sole reason that the numerics implementation in Clojure has strong Java underpinnings. Since version 1.3, Clojure has settled with 64-bit numerics as the default. Now, long and double are idiomatic and the default numeric types. Note that these are primitive Java types, not objects. Primitives in Java lead to high performance and have several optimizations associated with them at compiler and runtime levels. A local primitive is created on the stack (hence does not contribute to heap allocation and GC) and can be accessed directly without any kind of dereferencing. In Java, there also exist object equivalents of the numeric ...
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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.