How to Retrieve Inherited Non-Enumerable Properties in JavaScript?

Retrieving Inherited Non-Enumerable Properties

In JavaScript, accessing object properties relies on various methods tailored to specific requirements. However, when it comes to obtaining non-enumerable, non-own properties, there's no straightforward mechanism.

To address this, a custom function can be utilized that combines Object.getOwnPropertyNames() to obtain non-enumerable properties and walks up the prototype chain to retrieve inherited ones.

function getAllProperties(obj) {
  var allProps = [], curr = obj;
  do {
    var props = Object.getOwnPropertyNames(curr);
    props.forEach(function(prop) {
      if (allProps.indexOf(prop) === -1)
        allProps.push(prop);
    });
  } while (curr = Object.getPrototypeOf(curr));
  return allProps;
}

console.log(getAllProperties([1, 2, 3]));

In this example, [1, 2, 3] is an inherited property, and the function successfully retrieves it without inheriting its enumeration status. This approach empowers developers with the ability to access non-enumerable inherited properties, which is crucial for certain scenarios involving prototypes and object inheritance.

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