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title: collapse
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description: MuleSoft Documentation Site
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---
---
product: DataWeave
version: 2.11
---

# collapse

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

## collapse(text: String): Array<String>

Collapses the string into substrings of equal characters.

Each substring contains a single character or identical characters that are adjacent to one another
in the input string. Empty spaces are treated as characters.

_Introduced in DataWeave version 2.4.0._

### Parameters

<table><colgroup><col> <col></colgroup><thead><tr><th>Name</th><th>Description</th></tr></thead><tbody><tr><td><p><code>text</code></p></td><td><p>The string to collapse.</p></td></tr></tbody></table>

### Example

This example shows how the function collapses characters. Notice that the empty space (" ") is
treated as a character.

#### Source

```DataWeave
%dw 2.0
import collapse from dw::core::Strings
output application/json
---
collapse("a  b babb a")
```

#### Output

```Json
["a", "  ", "b", " ", "b", "a", "bb", " ", "a"]
```

## collapse(text: Null): Null

Helper function that enables `collapse` to work with a `null` value.

_Introduced in DataWeave version 2.4.0._