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lang: en
title: 'API docs: repository.deduplicate'
keywords: LoopBack 4.0, LoopBack 4, Node.js, TypeScript, OpenAPI
sidebar: lb4_sidebar
editurl: https://github.com/loopbackio/loopback-next/tree/master/packages/repository
permalink: /doc/en/lb4/apidocs.repository.deduplicate.html
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[Home](./index.md) > [@loopback/repository](./repository.md) > [deduplicate](./repository.deduplicate.md)
## deduplicate() function
Dedupe an array
<b>Signature:</b>
```typescript
export declare function deduplicate<T>(input: T[]): T[];
```
## Parameters
| Parameter | Type | Description |
| --- | --- | --- |
| input | T\[\] | an array of sourceIds |
<b>Returns:</b>
T\[\]
an array with unique items