> For the complete documentation index, see [llms.txt](https://docs.atfinity.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.atfinity.io/rule-language/operators/dictionary-operators/merge_dicts.md).

# merge\_dicts (or |)

{% hint style="info" %}
**New in Atfinity 17.**
{% endhint %}

### Description

`merge_dicts` merges any number of dictionaries into a single dictionary. It is variadic, so you can pass two, three, or more dictionaries. For merging exactly two dictionaries, the infix `|` operator can be used as a shorter alternative.

When the same key appears in more than one dictionary, the value from the **later** argument (or, for `|`, the **right-hand side**) wins. This matches the semantics of Python's `dict | dict` operator.

### Examples

```
merge_dicts({'a': 1}, {'b': 2})
// => {'a': 1, 'b': 2}
```

Later values overwrite earlier ones on overlap:

```
merge_dicts({'a': 1}, {'b': 2}, {'a': 99})
// => {'a': 99, 'b': 2}
```

Using the infix `|` operator:

```
{'a': 1} | {'b': 2}
// => {'a': 1, 'b': 2}

{'a': 1, 'b': 2} | {'b': 99}
// => {'a': 1, 'b': 99}
```


---

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