---
lang: en
title: 'API docs: context.instantiateclass'
keywords: LoopBack 4.0, LoopBack 4, Node.js, TypeScript, OpenAPI
sidebar: lb4_sidebar
editurl: https://github.com/strongloop/loopback-next/tree/master/packages/context
permalink: /doc/en/lb4/apidocs.context.instantiateclass.html
---

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[Home](./index.md) &gt; [@loopback/context](./context.md) &gt; [instantiateClass](./context.instantiateclass.md)

## instantiateClass() function

Create an instance of a class which constructor has arguments decorated with `@inject`<!-- -->.

The function returns a class when all dependencies were resolved synchronously, or a Promise otherwise.

<b>Signature:</b>

```typescript
export declare function instantiateClass<T>(ctor: Constructor<T>, ctx: Context, session?: ResolutionSession, nonInjectedArgs?: any[]): ValueOrPromise<T>;
```

## Parameters

|  Parameter | Type | Description |
|  --- | --- | --- |
|  ctor | [Constructor](./context.constructor.md)<!-- -->&lt;T&gt; | The class constructor to call. |
|  ctx | [Context](./context.context.md) | The context containing values for <code>@inject</code> resolution |
|  session | [ResolutionSession](./context.resolutionsession.md) | Optional session for binding and dependency resolution |
|  nonInjectedArgs | any\[\] | Optional array of args for non-injected parameters |

<b>Returns:</b>

[ValueOrPromise](./context.valueorpromise.md)<!-- -->&lt;T&gt;