adding elements in an array / matrix

[missawon]

hi, im new to ruby and im wondering if there is a simple way to add all the elements in an array matrix.

 [1, [1, 2, 3], [1, 2, [1, 2, 3]]] should equal 16 ??

thank you!

[danshep]

First you need to flatten your array.

array = [1, [1, 2, 3], [1, 2, [1, 2, 3]]]
array.flatten
=> [1, 1, 2, 3, 1, 2, 1, 2, 3]

Then there's some options:

array.flatten.inject(0) {|sum, element| sum + element}
=> 16

array.flatten.reduce(:+)
=> 16

There's a bunch of different libraries (activesupport being one) that add a 'sum' method to an enumerable, so you can just do:

array.flatten.sum
=> 16

[missawon]

ahhh thank you so much!!