Your first code block works exactly as you would expect and has been working like that for many years

The op did say they didn't want to do these type of checks.

I thought the answer was 'instanceof'?

	▲	culi 2 hours ago \| parent [-]
		I see what you mean, thanks. instanceof works if you're using javascript classes but not for "types". You can't do `instanceof Dog`. `instanceof` is a JavaScript feature https://developer.mozilla.org/en-US/docs/Web/JavaScript/Refe...