@polkadot/util
Version:
A collection of useful utilities for @polkadot
24 lines (23 loc) • 731 B
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.hexAddPrefix = hexAddPrefix;
const hasPrefix_js_1 = require("./hasPrefix.js");
/**
* @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
* ```
*/
function hexAddPrefix(value) {
return value && (0, hasPrefix_js_1.hexHasPrefix)(value)
? value
: `0x${value && value.length % 2 === 1 ? '0' : ''}${value || ''}`;
}