Single Quotes vs Double Quotes

String Interpolation

The usage of double quotes allows you to use string interpolation. This is essentially templating for strings. Example:

world = 'Saturn'
"Hello, #{world}"

This example will not work with single quotes.

Escaping Characters

The usage of double quotes allows you to escape any/all characters in a string. Example:

puts 'a\nb' # just print a\nb
puts "a\nb" # print a, then b at newline

Using single quotes will only allow you to escape other single quotes. Example:

puts 'this is james\'s favourite subject'