Monday Learnings

I learned some cool things today, which I’d like to share here.

1) The each_cons method. It’s great. While working on Project Euler #11 with a friend, he showed me this method. It is applied to an array and takes an argument for n elements – it then returns an enumerator with the different variations of 3 consecutive elements from the array. I’m not sure I’m doing it justice, so here is an example:

```ruby

array = [1,2,3,4,5,6,7,8]
array.each_cons(3).to_a 3 # => [[1, 2, 3], [2, 3, 4], [3, 4, 5], [4, 5, 6], [5, 6, 7], [6, 7, 8]]

``` This was very helpful in finding the products of each possible set of four consecutive elements (horizontally) in the problem’s grid. Nice.