John-Li/my_programs — comment on commit 1935bbe2058b98c3abd8a8119a9199d7bb5ad94d
File: book/files/task_489.rb line 17
By John-Li:

`IO.readlines` returns array with strings from file inside sub arrays. `.flatten!` gives me a clean array with strings from file excluding sub arrays. So think it's easier to with file in such form.