33 lines
618 B
Markdown
33 lines
618 B
Markdown
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# Functions
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<a id="bestnumberlag"></a>
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## bestNumberLag
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▸ **bestNumberLag**(api: *`ApiInterface$Rx`*): `(Anonymous function)`
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*Defined in [chain/bestNumberLag.ts:25](https://github.com/polkadot-js/api/blob/aea223f/packages/api-derive/src/chain/bestNumberLag.ts#L25)*
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*__description__*: Calculates the lag between finalised head and best head
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*__example__*:
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```javascript
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api.derive.chain.bestNumberLag((lag) => {
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console.log(`finalised is ${lag} blocks behind head`);
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});
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```
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**Parameters:**
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| Name | Type |
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| ------ | ------ |
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| api | `ApiInterface$Rx` |
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**Returns:** `(Anonymous function)`
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___
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