# Functions

<a id="bestnumberfinalised"></a>

##  bestNumberFinalised

▸ **bestNumberFinalised**(api: *`ApiInterface$Rx`*): `(Anonymous function)`

*Defined in [chain/bestNumberFinalised.ts:23](https://github.com/polkadot-js/api/blob/29c83a0/packages/api-derive/src/chain/bestNumberFinalised.ts#L23)*

*__description__*: Get the latest finalised block number. example  

```javascript
api.derive.chain.bestNumberFinalised((blockNumber) => {
  console.log(`the current finalised block is #${blockNumber}`);
});
```

**Parameters:**

| Name | Type |
| ------ | ------ |
| api | `ApiInterface$Rx` |

**Returns:** `(Anonymous function)`

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