"Make it as simple as possible. Just use document.write()"

Primitive script in its purest form.

substr instead of substring? Must be way too legacy

Also, why substr from index 1?

@asgs It was quick and both methods should to the same. Using substring may be clearer though. You're right with that.

Is used index 1 to remove the first character ("#"). I have an url like /rooms.html#<UUID> and need just the uuid.
document.location.hash also includes the hash.

I definitely will use that exception throwing from now on 😂