CODEWITHSUNDEEP
ruby
Saturn
Saturn

Reputation: 18159

Can I pass multiple arguments to an overloaded operator in Ruby?

class Test

  def << (*args)
    print "I got #{args.size} parameters.\n" 
  end

end

This works:

t = Test.new
t << 5

This doesn't work:

t = Test.new
t << 5,10

But this DOES work:

t = Test.new
t.<< 5,10

Why doesn't the second case work? Shouldn't it be equivalent to the third case?

Upvotes: 2

Views: 294

Answers (1)

Arup Rakshit
Arup Rakshit

Reputation: 118299

It works :- 

class Test
  def << (*args)
    print "I got #{args.size} parameters.\n" 
  end
end
t = Test.new
t << [5,10]
# >> I got 1 parameters.
t << (5..10)
# >> I got 1 parameters.

Why doesn't the second case work?

You have to pass it then in an array format(means you need to pass only one object as an argument). Your second one didn't work due to operator precedence.<< has higher precedence then ,. So your expression t << 5,10 becomes as (t << 5),10. That is why you got the error.

Upvotes: 4

Related Questions