CODEWITHSUNDEEP
rubyexception
sameera207
sameera207

Reputation: 16619

Having Exception handling as a common method in Ruby

Can someone tell me is there a way to make the exception handling as a common method and use it inside a methods? Let me explain it further.

For example, I have following methods

def add(num1, num2)
 begin
   num1 + num2
 rescue Exception => e
   raise e
 end 
end

def divide(num1, num2)
 begin
   num1 / num2
 rescue Exception => e
   raise e
 end 
end

As you can see, even though my method needs only one line, because of the exception handling code, the method gets bigger.

What I'm looking for is a more slimmer solution like (just a thought)

def add(num1, num2)
  num1 + num2 unless raise_exception
end

def divide(num1, num2)
 num1 / num2 unless raise_exception
end  

def raise_exception
  raise self.Exception
end

Please note the above code doesn't work, just my idea. Is this possible or is there any other good way?

Upvotes: 13

Views: 3425

Answers (4)

David
David

Reputation: 2331

def handle_exception(&block)
  yield
rescue Exception => e
  raise e
end

def add(num1, num2)
  handle_exception { num1 + num2 }
end

def divide(num1, num2)
  handle_exception { num1 / num2 }
end

Upvotes: 14

knut
knut

Reputation: 27845

Why do you rescue an Exception and raise it afterwords? Your calling routine must rescue again your exception.

You could do:

def divide(num1, num2)
   num1 / num2
end 

begin
  divide(1,0) 
rescue Exception => e
  puts "Exception '#{e}' occured"
end

You may rescue the Exception in one line:

def divide2(num1, num2)
  num1 / num2 rescue Exception 
end 

 p divide2(6,3) # -> 2
 p divide2(1,0) # -> Exception

But then you will loose the information which Exception occured.

Upvotes: 0

Vlad Khomich
Vlad Khomich

Reputation: 5880

yep, something like that:

 def try
    yield
  rescue Exception => e
    puts 'I`m rescued'
  end

  def devide(num1, num2)
   try { num1/num2 }
  end

ruby-1.9.2-p180 :013 > devide(5,1)
 => 5 
ruby-1.9.2-p180 :014 > devide(5,0)
I`m rescued
 => nil

Upvotes: 6

Dave Newton
Dave Newton

Reputation: 160171

Sure, you could pass a block in to a method that yields inside the begin section.

Upvotes: 0

Related Questions