# `Delta.Attr`
[🔗](https://github.com/slab/delta-elixir/blob/main/lib/delta/attr.ex#L1)

# `compose`

```elixir
@spec compose(a :: maybe_map(), b :: maybe_map(), keepNil :: boolean()) ::
  boolean() | map()
```

# `diff`
*since 0.4.0* 

```elixir
@spec diff(a :: maybe_map(), b :: maybe_map()) :: map()
```

# `invert`

```elixir
@spec invert(attr :: maybe_map(), base :: maybe_map()) :: map()
```

# `transform`

```elixir
@spec transform(a :: maybe_map(), b :: maybe_map(), priority :: boolean()) ::
  boolean() | map()
```

---

*Consult [api-reference.md](api-reference.md) for complete listing*