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 falsehow to check wether the property exist in a object in java script
if (obj.hasOwnProperty('prop')) {
// do something
}check if js property exists in class
myObj.hasOwnProperty(myProp)javascript check if object property exists
var person = {'first_name': 'bill','age':20};
if ( person.hasOwnProperty('first_name') ) {
//person has a first_name property
}Copyright © 2021 Codeinu
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