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@polkadot/util/hex/addPrefix.js

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1import { hexHasPrefix } from './hasPrefix.js';
2/**
* @name hexAddPrefix
* @summary Adds the `0x` prefix to string values.
* @description
* Returns a `0x` prefixed string from the input value. If the input is already prefixed, it is returned unchanged.
* @example
* <BR>
*
* ```javascript
* import { hexAddPrefix } from '@polkadot/util';
*
* console.log('With prefix', hexAddPrefix('0a0b12')); // => 0x0a0b12
* ```
*/
16export function hexAddPrefix(value) {
  return value && hexHasPrefix(value)
      ? value
      : `0x${value && value.length % 2 === 1 ? '0' : ''}${value || ''}`;
20}

1	`import { hexHasPrefix } from './hasPrefix.js';`
2	`/**`
3	`* @name hexAddPrefix`
4	* @summary Adds the `0x` prefix to string values.
5	`* @description`
6	* Returns a `0x` prefixed string from the input value. If the input is already prefixed, it is returned unchanged.
7	`* @example`
8	`* <BR>`
9	`*`
10	* ```javascript
11	`* import { hexAddPrefix } from '@polkadot/util';`
12	`*`
13	`* console.log('With prefix', hexAddPrefix('0a0b12')); // => 0x0a0b12`
14	* ```
15	`*/`
16	`export function hexAddPrefix(value) {`
17	`return value && hexHasPrefix(value)`
18	`? value`
19	: `0x${value && value.length % 2 === 1 ? '0' : ''}${value \|\| ''}`;
20	`}`