January 2014
Intermediate to advanced
232 pages
5h 11m
English
Content preview from Web Development with Clojure
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Named Functions
Named functions are simply anonymous functions bound to a symbol used as an identifier. Clojure provides a special form called def that’s used for creating global variables. It accepts a name and the body to be assigned to it. We can create a named function by using def as follows:
| | (def double (fn ([x] (* 2 x)))) |
Since this is such a common operation, Clojure provides a special form called defn that does it for us:
| | (defn square [x] |
| | (* x x)) |
The first argument to defn is the name of the function being defined. It is followed by a vector containing the arguments and the body of the function. In the preceding code, we passed in a single item for the body; however, we could pass as many items as we like:
| | ( ... |
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