When declaring an array of string, rather than declaring it literally as:
["apple", "orange"]We can do it as:
%w(apple orange)This saves typing the quote and comma. This is pretty well known.
What may be less known is that there is a difference between using %w() and %W(). The big one enables interpolation. For example
%w( #{1+1} ) #=> [ "\#{1+1}" ]
%W( #{1+1} ) #=> [ "2" ]Also, we know ruby don’t have character as variable type, it has only string. But you can declare a one character long string by using
?z #=> "z"This is sometimes useful in case statements (and saves one keystroke, woohoo).