Web Reference: Jul 20, 2025 · The Object.hasOwn() method returns true if the specified property is a direct property of the object — even if the property value is null or undefined. The method returns false if the property is inherited, or has not been declared at all. Jul 23, 2025 · This method was introduced as a replacement for the Object.hasOwnProperty () method. It is different from in operator as it does not check for inherited properties. Jun 5, 2022 · Object.hasOwn() is a static method which returns true if the specified object has the specified property as its own property. If the property is inherited, or does not exist, the method returns false.
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