How to sum array members in Ruby?

Question

I have an array of integers.

For example:

array = [123,321,12389]

Is there any nice way to get the sum of them?

I know, that

sum = 0
array.each { |a| sum+=a }

would work.

Answer 1

Try this:

array.inject{|sum,x| sum + x }

Documentation

Answer 2

Or try the ruby 1.9 way

array.inject(:+)

Answer 3

Alternatively (just for comparison), if you have Rails installed (actually just ActiveSupport):

require 'activesupport'
array.sum

Answer 4

Add sum to the Array class

class Array
    def sum
        self.inject{|sum,x| sum + x }
    end
end

Then do fun stuff like:

[1,2,3,4].sum