@polkadot/util/cjs/hex/stripPrefix.js

A collection of useful utilities for @polkadot

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.hexStripPrefix = hexStripPrefix;

var _hex = require("../is/hex");

// Copyright 2017-2022 @polkadot/util authors & contributors
// SPDX-License-Identifier: Apache-2.0

/**
 * @name hexStripPrefix
 * @summary Strips any leading `0x` prefix.
 * @description
 * Tests for the existence of a `0x` prefix, and returns the value without the prefix. Un-prefixed values are returned as-is.
 * @example
 * <BR>
 *
 * ```javascript
 * import { hexStripPrefix } from '@polkadot/util';
 *
 * console.log('stripped', hexStripPrefix('0x1234')); // => 1234
 * ```
 */
function hexStripPrefix(value) {
  if (!value || value === '0x') {
    return '';
  } else if (_hex.REGEX_HEX_PREFIXED.test(value)) {
    return value.substring(2);
  } else if (_hex.REGEX_HEX_NOPREFIX.test(value)) {
    return value;
  }

  throw new Error(`Expected hex value to convert, found '${value}'`);
}