check if object attribute exists javascript 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: how to check wether the property exist in a object in java script
if (obj.hasOwnProperty('prop')) {
// do something
}
Example 3: check if js property exists in class
myObj.hasOwnProperty(myProp)