Problem Statement

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.

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:

Let's start with the solution:

$a = @()

$a = ,2
$a = @(2)  # alternative

$a = 1,2,3

$a += 5

$a[1]

$a[1] = 42

$r = 1..100

$r[0..9+25..27+80,85,90]

$r[-1]  # last index