*Workflows › Reference › Functions › Array*

# Reduce

> A function of the expression language. Category: Array. `reduce`.

## Signature

```text
reduce({ input: anyArrayExpression, initialValue: anyExpression, in: anyExpression })
```

More in [Functions](https://docs.filmo.io/workflows/data-and-expressions).

FUNCTION `reduce`

## Arguments

| Name | Type | Required | Description |
| --- | --- | --- | --- |
| `input` | list | Yes |  |
| `initialValue` | any value | Yes |  |
| `in` | any value | Yes |  |

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Canonical URL: https://docs.filmo.io/workflows/reference/functions/reduce  
Last updated: 2026-10-25