---
title: "LazyLayoutKeyIndexMap"
description: "A [LazyLayoutKeyIndexMap] that keeps a mapping over given [IntRange] of items. Items outside of
given range are considered unknown, with null returned as the index."
type: "function"
---

<div class='type'>Function</div>


<a id='references'></a>
<div class='sourceset sourceset-common'>Common</div>


```kotlin
fun LazyLayoutKeyIndexMap(
    itemIndexRange: IntRange,
    intervalContent: LazyLayoutIntervalContent<*>,
): LazyLayoutKeyIndexMap
```


A `LazyLayoutKeyIndexMap` that keeps a mapping over given `IntRange` of items. Items outside of
given range are considered unknown, with null returned as the index.

#### Parameters

| | |
| --- | --- |
| itemIndexRange | Range of items to keep track of. |
| intervalContent | Source of item information in the form of `LazyLayoutIntervalContent`. |