optional-chaining.js

/* 
  Don't limit yourself, all of these work:
  obj.val?.prop
  obj.val?.[expr]
  obj.arr?.[index]
  obj.func?.(args)
*/

let defineUser = {
  name: "Markus",
  age: 29,
  location: {
    country: "USA"
  }
}

// We can now remove the layers of undefined checking we had before
if(typeof defineUser.location?.address !== "undefined") {
  console.log(defineUser.location.address);
}
else {
  console.log("No address is defined");
  // If the function doesn't exist, nothing will happen
  generateAddress?.();
}
   
// You can check for elements like this as well
console.log(defineUser?.["salary"]);