---
title: "add"
type: "function"
lastmod: "2026-08-27"
---
## API Reference

### add

> Source set: Android

```kotlin
override fun add(element: SubspaceLayoutNode) =
        set.add(element).also {
            if (extraAssertions) {
                check(mapOfOriginalDepth.getOrPut(element) { element.depth } == element.depth) {
                    "invalid node depth"
                }
            }
        }
```