This is a different argument than what megous was making (JS's support for mutating arguments validating that it's a good practice in a broad sense) "Unobserva

This is a different argument than what megous was making (JS's support for mutating arguments validating that it's a good practice in a broad sense) "Unobservable" or local mutation is completely fine (and pretty common in most functional programs that get to any significant scale)