Mastering Ruby Closures

Test Your Understanding!

1. Reimplement Symbol#to_proc. Now that you’ve seen how Symbol#to_proc is implemented, you should have a go at it yourself.

2. You can use #to_proc instantiate classes. . Consider this behavior:

   class SpiceGirl
     def initialize(name, nick)
       @name = name
       @nick = nick
     end
   
     def inspect
       "#{@name} (#{@nick} Spice)"
     end
   end
   
   spice_girls = [["Mel B", "Scary"], ["Mel C", "Sporty"],
   ["Emma B", "Baby"], ["Geri H", "Ginger",], ["Vic B", "Posh"]]
   
   p spice_girls.map(&SpiceGirl)

   This returns:

   [Mel B (Scary Spice), Mel C (Sporty Spice),
    Emma B (Baby Spice), Geri H (Ginger Spice), Vic B (Posh Spice)]

   This example demonstrates how to_proc can be used to initialize a class. ...