Returns the lowest index whose corresponding array value is equal to a given object.
SDKs
- iOS 2.0+
- macOS 10.0+
- Mac Catalyst 13.0+
- tvOS 9.0+
- watchOS 2.0+
Framework
- Foundation
Declaration
func index(of anObject: Any) -> Int
Parameters
anObjectAn object.
Return Value
The lowest index whose corresponding array value is equal to an. If none of the objects in the array is equal to an, returns NSNot.
Discussion
Starting at index 0, each element of the array is passed as an argument to an is message sent to an until a match is found or the end of the array is reached. Objects are considered equal if is (declared in the NSObject protocol) returns true.