# enumerateObjects(at:options:using:) Executes the specified block using the objects in the fetch result at the specified indexes. ``` func enumerateObjects(at s: IndexSet, options opts: NSEnumerationOptions = [], using block: @escaping (ObjectType, Int, UnsafeMutablePointer) -> Void) ``` ## Parameters `s` The indexes of the objects over which to enumerate. `opts` A bit mask that specifies the options for the enumeration (whether it should be performed concurrently and whether it should be performed in reverse order). `block` The block to apply to elements in the fetch result. The block takes three parameters: - obj: The element in the fetch result. - idx: The index of the element in the fetch result. - stop: A pointer to a Boolean value. Set `*stop` to `true` within the block to cancel further processing of the fetch result. ## Discussion By default, the enumeration starts with the first object and continues in order through the fetch result to the last element specified by the index set. Specify the `concurrent` or `reverse` options to modify this behavior. This method executes synchronously. --- 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)