javascript check if object contains property code example
Example 1: js check if object has property
const object1 = new Object();
object1.property1 = 42;
console.log(object1.hasOwnProperty('property1'));
// expected output: true
Example 2: javascript does object have property
var person = {'first_name': 'bill','age':20};
if ( person.hasOwnProperty('first_name') ) {
//person has a first_name property
}
Example 3: object contains property javascript
if (x.hasOwnProperty('y')) {}
//or
if ('y' in x) {}
//or
if (x?.y){}