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function memoize (func, hashFunc) {
  hashFunc = hashFunc || function () {
    return arguments[0];
  }
  const memoizedFunc = function () {
    let result;
    let key = hashFunc.apply(null, arguments);
    if (memoizedFunc.cache[key] !== undefined) {
      result = memoizedFunc.cache[key];
    } else {
      result = func.apply(null, arguments);
      memoizedFunc.cache[key] = result;
    }
    return result;
  }
  memoizedFunc.cache = {};
  return memoizedFunc;
}