Ruby/Array/Array Literal

words = %w[this is a test]  # Same as: ["this", "is", "a", "test"]
open = %w| ( [ { < |        # Same as: ["(", "[", "{", "<"]
white = %W(\s \t \r \n)     # Same as: ["\s", "\t", "\r", "\n"]

x = 1
y = 2
[1, 2, 3]         # An array that holds three Fixnum objects
[-10...0, 0..10,] # An array of two ranges; trailing commas are allowed
[[1,2],[3,4],[5]] # An array of nested arrays
[x+y, x-y, x*y]   # Array elements can be arbitrary expressions
[]                # The empty array has size 0