问题
Clojure uses a number of special characters such as
^String#(xyz ...)%&#_(some form here)>!
and many more. How can I search for documentation for these special characters, given that Google et al mostly ignore special characters in web pages and search strings?
回答1:
This question and others have raised an important topic: it can often be difficult and frustrating to find documentation on special characters used in Clojure source code.
The first place to look is the Clojure docs themselves. There is even a special page devoted to this topic:
- https://clojure.org/guides/weird_characters
Many of the special characters are known as Reader Literals, which also have a documentation page:
- https://clojure.org/reference/reader
You can also find hints regarding special chars & their usage on:
- The Clojure CheatSheet
- ClojureDocs.org
- Clojure-Doc.org
Finally, the search engine SymbolHound.com can search for special symbols that Google & others ignore. For example, consider this Clojure code:
(defn lines
"Given an open reader, return a lazy sequence of lines"
[^java.io.BufferedReader reader]
(take-while identity (repeatedly #(.readLine reader))))
How could we search for the meaning of ^java.io.BufferedReader on the 3rd line? If we go to SymbolHound and use the search string clojure ^ we get back:
270 results found for clojure ^
- What are the usages for ^ and how can I get more information on it?
- Clojure syntax question re: #^
- How do I dynamically find metadata for a Clojure function?
and many more answers.
回答2:
They're all described here:
https://clojure.org/guides/weird_characters
You can also add more by contributing:
https://clojure.org/community/contributing_site
来源：https://stackoverflow.com/questions/50460044/how-do-i-search-for-special-characters-in-clojure