How to check a object is empty or null? (Javascript)

That code block is object check for empty or null control.

	var test = {};
	if (test==null && isEmpty(test)) {
	console.log("is empty");
	} else {
	console.log("is not empty");
	}
	function isEmpty(obj) {
	for (var key in obj) {
	if (obj.hasOwnProperty(key))
	return false;
	}
	return true;
	}

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