Answers for "short form check if object and object property exists javascript &."

javascript check if object property exists

var person = {'first_name': 'bill','age':20};

if ( person.hasOwnProperty('first_name') ) {
    //person has a first_name property
}

Check object property exists or not in js

const user1 = {
	username: "john"
};
const user2 = {
	username: "duo"
    authority: "grepper"
}
// check object property
console.log(user1.hasOwnProperty('authority')); // false
console.log(user2.hasOwnProperty('authority')); // true