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title: partition
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---
---
product: DataWeave
version: 2.3
---

# partition

> For the full documentation index, see: https://docs.mulesoft.com/llms.txt

## partition(Array<T>, (item: T) -> Boolean): { success: Array<T>, failure: Array<T> }

Separates the array into the elements that satisfy the condition from those that do not.

_Introduced in DataWeave 2.2.0. Supported by Mule 4.2 and later._

### Parameters

<table><colgroup><col> <col></colgroup><thead><tr><th>Name</th><th>Description</th></tr></thead><tbody><tr><td><p><code>array</code></p></td><td><p>The array of elements to split.</p></td></tr><tr><td><p><code>condition</code></p></td><td><p>The condition (or expression) used to match an element in the array.</p></td></tr></tbody></table>

### Example

This example partitions numbers found within an input array. The even numbers match the criteria set
by the lambda expression `(item) → isEven(item)`. The odd do not. The function generates the
`"success"` and `"failure"` keys within the output object.

#### Source

```DataWeave
%dw 2.0
import * from dw::core::Arrays
output application/json
var arr = [0,1,2,3,4,5]
---
arr partition (item) -> isEven(item)
```

#### Output

```json
{
  "success": [0, 2, 4],
  "failure": [1, 3, 5]
}
```