splat operator in Ruby

Arraying your arguments

The list of parameters passed to an object is, in fact, available as a list. To do this, we use what is called the splat operator – which is just an asterisk (*).

The splat operator is used to handle methods which have a variable parameter list. Let’s use it to create an add method that can handle any number of parameters.

We use the inject method to iterate over arguments

def add(*numbers)
  numbers.inject(0) { |sum, number| sum + number }
end

puts add(1)
puts add(1, 2)
puts add(1, 2, 3)
puts add(1, 2, 3, 4)

 

Ref – https://rubymonk.com/learning/books/1-ruby-primer/chapters/19-ruby-methods/lessons/69-new-lesson#solution3885

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