Immutable Local Bindings
Names can be bound to values & and data structures with either the
let function. The
def binding is global to the namespace, however the
let function is local to its use.
letfunction is typically used to define names within a function definition, or in snippets of code created during repl driven development.
(let [five 5] (str "Within the let expression the value is " five)) ;; => Within the let expression the value is 5 ;; evaluating the name five outside the let expression returns an error five ;; => Unable to resolve symbol: five in this context
Create a local binding called number that represents the value 5 using the
letfunction. Increment the number, then print out the value of number.