April 2012
Intermediate to advanced
296 pages
7h 3m
English
Content preview from Programming Clojure, 2nd Edition
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Wrestling with the Integers
Clojure provides three different sets of operations for integer types:
- The unchecked operators
- The default operators
- The promoting operators
The following table gives a sampling of these operator types.
Unchecked | Default | Promoting |
|---|---|---|
unchecked-add | + | +’ |
unchecked-subtract | - | -’ |
unchecked-multiply | * | *’ |
unchecked-inc | inc | inc’ |
unchecked-dec | dec | dec’ |
The unchecked operators correspond exactly with primitive math in Java. They are fast but terrifically dangerous in that they can overflow silently and give incorrect answers. In Clojure, the unchecked operators should be used only in the rare situation that overflow is the desired behavior or when performance is paramount and you are certain overflow is impossible or irrelevant.
(unchecked-add ... |
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