What does puts [1, 2, 3, 4].each_cons(2).to_a.inspect output?

Console output

Why

`Enumerable#each_cons(n)` iterates over consecutive sub-arrays of size `n` (sliding window). For `[1, 2, 3, 4]` with `n = 2`, the windows are `[1, 2]`, `[2, 3]`, and `[3, 4]`.