# indicesOfObjects(byEvaluatingObjectSpecifier:) Returns the indices of the specified container objects. ``` func indicesOfObjects(byEvaluatingObjectSpecifier specifier: NSScriptObjectSpecifier) -> [NSNumber]? ``` ## Parameters `specifier` An object specifier for the container objects for which to obtain the indices. ## Return Value A zero-based array of `NSNumber` objects that identify the zero-based indices of the container objects that match `specifier`, or `nil` if no matching objects were found. ## Discussion Containers that want to evaluate some specifiers on their own should implement this method. If this method returns `nil`, the object specifier will go on to do its own evaluation, so you should only return `nil` if that’s the behavior you want, or if an error occurs. If this method returns an array, the object specifier will use the `NSNumber` objects in it as the indices. So, if you evaluate the specifier and there are no objects that match, you should return an empty array, not `nil`. If you find only one object, you should still return its index in an array. Returning an array with a single index where the index is –1 is interpreted to mean all the objects. For an example implementation, see “Implementing Object Specifiers” in [Object Specifiers](https://developer.apple.com/library/archive/documentation/Cocoa/Conceptual/ScriptableCocoaApplications/SApps_object_specifiers/SAppsObjectSpecifiers.html#//apple_ref/doc/uid/TP40002164-CH3) in [Cocoa Scripting Guide](https://developer.apple.com/library/archive/documentation/Cocoa/Conceptual/ScriptableCocoaApplications/SApps_intro/SAppsIntro.html#//apple_ref/doc/uid/TP40002164) --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)