ObjecthasOwno

Object.hasOwn is a static method of the Object object in JavaScript that determines whether an object has a given property as its own property, not inherited from its prototype chain. It was introduced in ECMAScript 2022.

The syntax for Object.hasOwn is Object.hasOwn(obj, prop). It takes two arguments: obj, the object to check, and prop, the property name or symbol to look for. It returns true if the object has the specified own property, and false otherwise.

This method is a more robust and reliable alternative to Object.prototype.hasOwnProperty. Unlike hasOwnProperty, Object.hasOwn can be called on objects that have overridden the hasOwnProperty method or on null and undefined values without throwing an error. For example, Object.hasOwn(Object.create(null), 'foo') will return false, whereas Object.create(null).hasOwnProperty('foo') would throw a TypeError.

Object.hasOwn is useful in scenarios where you need to explicitly check for properties directly defined on an object, such as when working with data objects, configuration settings, or when dealing with objects created using Object.create(null) which do not inherit from Object.prototype. It helps prevent unexpected behavior that might arise from inherited properties or from calling hasOwnProperty on objects that don't have access to the Object.prototype.