This would make an excellent FAQ question and answer! On Sat, Dec 20, 2008 at 9:53 AM, Stuart Sierra <the.stuart.sie...@gmail.com>wrote:
> > This might make a good FAQ question: > > On Dec 20, 11:25 am, chris <cnuern...@gmail.com> wrote: > > I am unclear as to the difference between refer, import use, and require. > > Hi Chris, > > require: Load a Clojure library from a file on classpath. Use this > when you want to load a library, but leave it in its own namespace. > > refer: Bring public symbols from one namespace into the current > namespace. Use this when a library has already been loaded (example: > clojure.set) but you want to use its public symbols without a > namespace qualifier. > > import: Copy Java class names into current namespace. Use this when > you want to use a Java class without typing the full package name. > > use: Combination of require and refer. Use this when you want to load > a library AND use its symbols without a namespace qualifier. > > All four are available as keyword arguments to "ns", which is the > preferred way to use them: > > (ns foo.bar > (:use my.little.lib) > (:require clojure.contrib.duck-streams) > (:import (java.io File InputStream)) > (:refer clojure.set)) > > ":require" also allows aliasing, like this: > (ns foo.bar > (:require [clojure.set :as set])) > > Now you can write the symbol "clojure.set/union" as "set/union". > > -Stuart Sierra > > > --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~----------~----~----~----~------~----~------~--~---
