Man, good job on writing and puttin you out there, but I made an account just to reply on this. Hate to see things overused just because they're shiny.
I noted there was some legacy code that was using loops and wasn't really efficient with the tools we have nowadays.
You replaced one completely fine loop with two loops and a ton of allocations. for is not freaking outdated. I think you meant to say "pretty" or "easier to follow", because the "modern" version is way, way less efficient than the original.