---
category: [Administration & Integrations, Platform and Product Extensions, Platform and Product Extensions/Integration, Administration & Integrations/Custom Integrations & Apps, Platform and Product Extensions/Workday Extend]
keyword: [Extend, PMD Scripting, Scripts]
nav: wcp_docs
parent_url: /wcp_docs/
title: reduce (closure)
layout: subsection
---

## <a id="section_m3p_myb_5db"></a>Description

Executes the specified reducer function on each element of the list, resulting in a single output value.

## <a id="section_cyq_j1m_zsb"></a>Return Type

`Object`

## <a id="section_dz5_pwg_5db"></a>Instance Method Syntax

```
thisList.reduce(closure)
```

<table><thead><tr><th>Parameter</th><th>Description</th></tr></thead><tbody><tr><td>closure</td><td>The BiFunction (with 2 parameters) that reduces the element into a single output value. <p>Within a closure, you can't redefine the variables that are declared outside the closure.</p></td></tr></tbody></table><br/>

<b>Example</b>

`[1,2,3].reduce((x, y) => {x + y})`

Returns `6`

## <a id="section_njs_xzl_zsb"></a>Namespace Function Syntax

```
list:reduce(list, closure)
```

<table><thead><tr><th>Parameter</th><th>Description</th></tr></thead><tbody><tr><td>list</td><td>The input List.</td></tr><tr><td>closure</td><td>The BiFunction (with 2 parameters) that reduces the element into a single output value.</td></tr></tbody></table><br/>