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rubychainingmethod-chaining

Ruby Method Chaining

I would like to chain my own methods in Ruby. Instead of writing ruby methods and using them like this: 

def percentage_to_i(percentage)
  percentage.chomp('%')
  percentage.to_i
end

percentage = "75%"
percentage_to_i(percentage)
=> 75

I would like to use it like this: 

percentage = "75%"
percentage.percentage_to_i
=> 75

How can I achieve this?

Solution

  • You have to add the method to the String class:

    class String
  def percentage_to_i
    self.chomp('%')
    self.to_i
  end
end

    With this you can get your desired output:

    percentage = "75%"
percentage.percentage_to_i # => 75

    It's kind of useless, because to_i does it for you already:

    percentage = "75%"
percentage.to_i # => 75