JAVASCRIPT

js check if object has property

const object1 = new Object();
object1.property1 = 42;

console.log(object1.hasOwnProperty('property1'));
// expected output: true

object has property

hero.hasOwnProperty('name');     // => true

object contains property javascript

if (x.hasOwnProperty('y')) {}

//or

if ('y' in x) {}

//or

if (x?.y){}