@tetcoin/util/u8a/concat.js

A collection of useful utilities for @tetcoin

"use strict";

var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault");

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = u8aConcat;

var _toU8a = _interopRequireDefault(require("./toU8a"));

// Copyright 2017-2019 @polkadot/util authors & contributors
// This software may be modified and distributed under the terms
// of the Apache-2.0 license. See the LICENSE file for details.

/**
 * @name u8aConcat
 * @summary Creates a concatenated Uint8Array from the inputs.
 * @description
 * Concatenates the input arrays into a single `UInt8Array`.
 * @example
 * <BR>
 *
 * ```javascript
 * import { u8aConcat } from '@tetcoin/util';
 *
 * u8aConcat(
 *   new Uint8Array([1, 2, 3]),
 *   new Uint8Array([4, 5, 6])
 * ); // [1, 2, 3, 4, 5, 6]
 * ```
 */
function u8aConcat() {
  for (var _len = arguments.length, _list = new Array(_len), _key = 0; _key < _len; _key++) {
    _list[_key] = arguments[_key];
  }

  const list = _list.map(_toU8a.default);

  const length = list.reduce((total, item) => total + item.length, 0);
  const result = new Uint8Array(length);
  let offset = 0;
  return list.reduce((result, item) => {
    result.set(item, offset);
    offset += item.length;
    return result;
  }, result);
}