javascript check if object only specific property code example
Example 1: 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
Example 2: js check if object has property
const object1 = new Object();
object1.property1 = 42;
console.log(object1.hasOwnProperty('property1'));
// expected output: true
Example 3: check the properties of an object in javascript
for (var name in object) {
if (object.hasOwnProperty(name)) {
// do something with name
}
}
// OR
const hero = {
name: 'Batman'
};
hero.hasOwnProperty('name'); // => true
hero.hasOwnProperty('realName'); // => false
Example 4: javascript does object have property
var person = {'first_name': 'bill','age':20};
if ( person.hasOwnProperty('first_name') ) {
//person has a first_name property
}