JAVASCRIPT

How to tell if an attribute exists on an object

const user = {
    name: "Sicrano",
    age: 14
}

user.hasOwnProperty('name');       // Retorna true
user.hasOwnProperty('age');        // Retorna true
user.hasOwnProperty('gender');     // Retorna false
user.hasOwnProperty('address');    // Retorna false

JavaScript check if property exists in Object

const userOne = {
  name: 'Chris Bongers',
  email: 'info@daily-dev-tips.com',
};

const userTwo = {
  name: 'John Do',
};

console.log(userOne.hasOwnProperty('email'));
// Returns: true

console.log(userTwo.hasOwnProperty('email'));
// Returns: false