This task is about arrays.

For hashes or associative arrays, please see Creating an Associative Array.

For a definition and in-depth discussion of what an array is, see Array.



Task

Show basic array syntax in your language.

Basically, create an array, assign a value to it, and retrieve an element   (if available, show both fixed-length arrays and
dynamic arrays, pushing a value into it).

Please discuss at Village Pump:   Arrays.

Please merge code in from these obsolete tasks:

   Creating an Array
   Assigning Values to an Array
   Retrieving an Element of an Array


Related tasks

   Collections
   Creating an Associative Array
   Two-dimensional array (runtime)


(defvar li (list 1 2 3))      ;; (1 2 3)
(defvar ve (vec 1 2 3)) ;; make vector #(1 2 3)
;; (defvar ve (vector 3)) ;; make #(nil nil nil)

[ve 0]    ;; yields 1
[li 0]    ;; yields 1
[ve -1]   ;; yields 3
[li 5]    ;; yields nil
[li -50]  ;; yields nil
[ve 50]   ;; error

(set [ve 2] 4) ;; changes vector to #(1 2 4).
(set [ve 3] 0) ;; error
(set [ve 3] 0) ;; error