bank-client-js/src/util.ts

function zero2(word) {
  if (word.length === 1) {
    return '0' + word;
  }
  else {
    return word;
  }
}

export function toArray(msg, enc) {
  if (Array.isArray(msg)) {
    return msg.slice();
  }
  if (!msg) {
    return [];
  }
  const res: number[] = [];
  if (typeof msg !== 'string') {
    for (let i = 0; i < msg.length; i++) {
      res[i] = msg[i] | 0;
    }
    return res;
  }
  if (enc === 'hex') {
    msg = msg.replace(/[^a-z0-9]+/ig, '');
    if (msg.length % 2 !== 0) {
      msg = '0' + msg;
    }
    for (let i = 0; i < msg.length; i += 2) {
      res.push(parseInt(msg[i] + msg[i + 1], 16));
    }
  } else {
    for (let i = 0; i < msg.length; i++) {
      const c = msg.charCodeAt(i);
      const hi = c >> 8;
      const lo = c & 0xff;
      if (hi) {
        res.push(hi, lo);
      }
      else {
        res.push(lo);
      }
    }
  }
  return res;
}
    
export function encodeHex(msg: Buffer | Uint8Array) {
  let res = '';
  for (let i = 0; i < msg.length; i++) {
    res += zero2(msg[i].toString(16));
  }
  return res;
}

export function uuid(): string {
  return "xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx".replace(/[xy]/g, (char) => {
    // tslint:disable-next-line: no-bitwise
    const random = Math.random() * 16 | 0; 
    const value = char === "x" ? random : (random % 4 + 8);
    return value.toString(16);
  });
}

export function isObject(item) {
  return (item && typeof item === 'object' && !Array.isArray(item));
}

export function mergeDeep(target: object, source: object) {
  const output = Object.assign({}, target);
  if (isObject(target) && isObject(source)) {
    Object.keys(source).forEach(key => {
      if (isObject(source[key])) {
        if (!(key in target)) {
          Object.assign(output, { [key]: source[key] });
        }
        else {
          output[key] = mergeDeep(target[key], source[key]);
        }
      } else {
        Object.assign(output, { [key]: source[key] });
      }
    });
  }
  return output;
}