39 lines
785 B
Markdown
39 lines
785 B
Markdown
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# Functions
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<a id="hexhasprefix"></a>
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## hexHasPrefix
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▸ **hexHasPrefix**(value: * `string` | `null` | `undefined`*): `boolean`
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*Defined in [hex/hasPrefix.ts:22](https://github.com/polkadot-js/common/blob/dc07e26/packages/util/src/hex/hasPrefix.ts#L22)*
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*__name__*: hexHasPrefix
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*__signature__*: hexHasPrefix (value: ?string): boolean
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*__summary__*: Tests for the existence of a `0x` prefix.
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*__description__*: Checks for a valid hex input value and if the start matched `0x`
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*__example__*:
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```javascript
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import { hexHasPrefix } from '@polkadot/util';
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console.log('has prefix', hexHasPrefix('0x1234')); // => true
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```
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**Parameters:**
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| Param | Type |
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| ------ | ------ |
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| value | `string` | `null` | `undefined`|
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**Returns:** `boolean`
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___
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