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# index(of:in:)

Returns the lowest index within the specified range whose corresponding object in the fetch result is equal to the specified object.

```
func index(of anObject: ObjectType, in range: NSRange) -> Int
```

## Parameters

`anObject`

An object.

`range`

The range of indexes in the fetch result within which to search for `anObject`.

## Return Value

The lowest index within `range` whose corresponding object in the fetch result is equal to `anObject`, or `NSNotFound` if no such object is in the fetch result.

## Discussion

Starting at `range.location`, this method sends an `==` message to each object in the fetch result until it finds a match or reaches the end of the fetch result. This method passes the `anObject` parameter to each `==` message.

Raises a range exception if the `range` parameter represents a range that doesn’t exist in the fetch result.

---

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