Right there on page 15 of the Pickaxe is where you’ll find today’s tip. When interpolating variables within a double quoted string, we typically use #{var_name} to interpolate variables. Ruby provides a shortcut for global, instance, and class variables (but not locals), making the brackets are optional.
#!/usr/bin/env ruby
dipsy_color = 'green' # local
$lala_color = 'yellow' # global
@po_color = 'red' # instance
@@tinky_winky_color = 'purple' # class
puts "Dipsy is #{dipsy_color}"
puts "Lala is #$lala_color"
puts "Po is #@po_color"
puts "Tinky Winky is #@@tinky_winky_color"
This produces the following output:
Dipsy is green
Lala is yellow
Po is red
Tinky Winky is purple
For what it’s worth, I prefer the readability of the brackets. It’s just one of those little things you may have missed…
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