Loads a namespace if not already loaded. It takes an argument(symbol) which should be a quoted
(require 'clojure.string) ;; => nil
After requiring a namespace, we need to refer the functions in a fully qualified names. Like,
(require 'clojure.string) ;; => nil (clojure.string/split "This is an example of require" #" " ) ;; => ["This" "is" "an" "example" "of" "require"]
Other way is to alias a namespace at the time of requring using
(require '[clojure.string :as string]) ;; => nil (string/capitalize "hello") ;; => "Hello"
The vector here is to avoid quoting every symbol,