@loopback/docs/site/apidocs/context.binding.todynamicvalue.md

Documentation for LoopBack 4

---
lang: en
title: 'API docs: context.binding.todynamicvalue'
keywords: LoopBack 4.0, LoopBack 4
sidebar: lb4_sidebar
permalink: /doc/en/lb4/apidocs.context.binding.todynamicvalue.html
---

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[Home](./index.md) &gt; [@loopback/context](./context.md) &gt; [Binding](./context.binding.md) &gt; [toDynamicValue](./context.binding.todynamicvalue.md)

## Binding.toDynamicValue() method

Bind the key to a computed (dynamic) value.

<b>Signature:</b>

```typescript
toDynamicValue(factoryFn: () => ValueOrPromise<T>): this;
```

## Parameters

|  Parameter | Type | Description |
|  --- | --- | --- |
|  factoryFn | <code>() =&gt; ValueOrPromise&lt;T&gt;</code> | The factory function creating the value. Both sync and async functions are supported. |

<b>Returns:</b>

`this`

## Example


```ts
// synchronous
ctx.bind('now').toDynamicValue(() => Date.now());

// asynchronous
ctx.bind('something').toDynamicValue(
 async () => Promise.delay(10).then(doSomething)
);

```