Example
Functions are defined with five components:
The header, which includes the defn keyword, the name of the function.
(defn welcome ....)
An optional Docstring that explains and document what the function does.
(defn welcome
"Return a welcome message to the world"
...)
Parameters listed in brackets.
(defn welcome
"Return a welcome message"
[name]
...)
The body, which describes the procedures the function carries out.
(defn welcome
"Return a welcome message"
[name]
(str "Hello, " name "!"))
Calling it:
=> (welcome "World")
"Hello, World!"
