# indicesOfObjectsByEvaluating(withContainer:count:) This primitive method must be overridden by subclasses to return a pointer to an array of indices identifying objects in the key of a given container that are identified by the receiver of the message. ``` func indicesOfObjectsByEvaluating(withContainer container: Any, count: UnsafeMutablePointer) -> UnsafeMutablePointer? ``` ## Discussion This primitive method must be overridden by subclasses to return a pointer to an array of indices identifying objects in the key of the container `aContainer` that are identified by the receiver of the message. The method uses key-value coding to obtain values based on the receiver’s key. It returns the number of such matching objects by indirection in `numRefs`. It returns `nil` directly and –1 via `numRefs` if all objects in the container (or the sole object) match the value of the receiver’s key. This method is invoked by [`objectsByEvaluating(withContainers:)`](/documentation/Foundation/NSScriptObjectSpecifier/objectsByEvaluating(withContainers:)). The default implementation returns `nil` directly and –1 indirectly via `numRefs`. --- 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)