Determines if any value is "falsy" in JavaScript

isFalsy.js

// this function takes in any parameter and can tell if it's "falsy" or not.
// falsy means it's either false, 0, null, undefined, NaN, or an empty string/array/object
// see the test cases at the bottom for a clearer picture

function isFalsy(item) {
	try {
		if (
			!item                                               // handles most, like false, 0, null, etc
			|| (
				typeof item == "object" && (
					Object.keys(item).length == 0                    // for empty objects, like {}, []
					&& !(typeof item.addEventListener == "function") // omit webpage elements
				)
			)
		) {
				return true;
		}
	} catch(err) { return true; }
	
	return false;
};

/*******************
**** TEST CASES ****
********************/

// These are falsy. isFalsy(value) === true

console.log(isFalsy(null));
console.log(isFalsy(undefined));
console.log(isFalsy(NaN));
console.log(isFalsy(0));
console.log(isFalsy(false));
console.log(isFalsy(''));
console.log(isFalsy([]));
console.log(isFalsy({}));

console.log("----");
// These are not falsy. isFalsy(value) === false

console.log(isFalsy("0"));
console.log(isFalsy(document.createElement('div')));
console.log(isFalsy(window));
console.log(isFalsy(console));
console.log(isFalsy(document));
console.log(isFalsy({0: 3, 'test': 'hi'}));
console.log(isFalsy([1,2,3]));

isTruthy.js

function isTruthy(item) {
	return !isFalsy(item);
}