Built-in Ruby classes that have literal constructors

1, String
Quotation marks

"new string" or 'new string'

2, Symbol
Leading colon

:symbol or :"symbol with spaces"

3, Array
Square brackets

[1, 2, 3, 4, 5]

4, Hash
Curly braces

{"New York" => "NY", "Oregon" => "OR"}

5, Range
Two or three dots

0...10 or 0..9

6, Regexp
Forward slashes

/([a-z]+)/