refactoring ruby method

this is a simple question...

Does this method can be refactored?

def sum
  total = 0
  [1,2,3,4].each do |num|
    total += num
  end
  total
end
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thanks for your help!

You can use this:

[1,2,3,4].inject(0, :+) # => 10

[1,2,3,4].inject { |total,num| total= total+num }

OR as per suggestion below it should be

[1,2,3,4].inject(0) { |total,num| total+num }

>> [1, 2, 3, 4].inject(0) { |acc, x| acc + x }
=> 10

Or simply:

>> [1, 2, 3, 4].inject(0, :+)
=> 10

Same as the following How to sum array of numbers in Ruby?