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JavaScript handler.preventExtensions() Method18 Mar 2025 | 1 min read The handler.preventExtensions() method is used to trap the Object.preventExtensions method. When extensions are prevented on an object, new properties can't be added. SyntaxParameterstarget: The target object. Return valueReturn a Boolean value. Browser Support
Example 1Output: true Example 2Output: true [object Object] false Example 3Output: false false Next TopicJavaScript handler |
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