Salesforce JavaScript Developer Practice Exam

What will happen if a property is excluded in the JSON.stringify replacer array?

1. The property will still be part of the JSON string.

2. The property will throw an error.

3. The property will not appear in the resulting JSON string.

4. The property value will be set to null in the JSON string.

The correct answer is: The property will not appear in the resulting JSON string.

The answer is correct because when you use the `JSON.stringify` method with a replacer array, any property that is specified in that array will be included in the resulting JSON string, while properties that are excluded from the array will not appear in the output. This behavior allows developers to control which properties of an object are serialized into JSON format. For instance, if you have an object with several properties and only want to include certain properties in the JSON output, you can specify only those properties in the replacer array. Any property not listed in the array will simply be omitted from the resulting JSON string. This feature is particularly useful for managing the size of the data being transmitted over the network or for removing sensitive information before serialization. It enhances the ability to customize the serialization process easily, making it a powerful tool for developers utilizing JSON in JavaScript. Other options describe scenarios that do not occur when using the replacer parameter effectively. There's no error thrown for properties not included in the replacer array, nor is there a setting of those property values to null. The output simply omits them.