macOS Turn wifi on when ethernet unplugged and vice versa -- applescript

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Hi here is an apple script that i created that turns on wifi when there is no ethernet connection and turns it off when there is.
Just thought I would put it out there for anyone who may find it useful.

property wifi : 0
repeat
	try
		do shell script "ipconfig getifaddr en0"
		if wifi = 1 then
			do shell script "networksetup -setairportpower en1 off"
			set wifi to 0
		end if
	on error
		if wifi = 0 then
			do shell script "networksetup -setairportpower en1 on"
			set wifi to 1
		end if
	end try
	delay 3
end repeat

Hope its useful. This is all self taught so if there is anything that is bad practice please let me know