Web Reference: Sometimes it is useful to check if the property of a given object exists or not. We can use the .hasOwnProperty (propname) method of objects to determine if that object has the given property name.... JavaScript is easy to learn. This tutorial covers everything from basic JavaScript up to the latest 2026 version. Start learning JavaScript now » With our Try it Yourself editor, you can edit the source code and view the result. We recommend reading this tutorial, in the sequence listed in the menu. Aug 18, 2025 · This page lists JavaScript tests you can try so you can verify if you've understood the content in this module.
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