How to get values from an Array except undefined,null, and empty value

var ages = [32, 33, 16, undefined];

function checkAdult(age) {
return !!age;
}

function myFunction() {
document.getElementById(“demo”).innerHTML = ages.filter(checkAdult);
}

// 32, 33, 16

• !!v 코드가 undefined, null, empty value, empty array 를 걸러낸다.
  empty object는 [object object]로 반환된다.

#ref

• Zerocho JS 중급강좌 8–12 중
• https://stackoverflow.com/a/58399315/8249747
• https://www.techiedelight.com/remove-falsy-values-from-an-array-in-javascript/