code: function forEach(data, callback) {
    if (data && isFunction(callback)) {
      if (Array.isArray(data) || isNumber(data.length)
      /* array-like */
      ) {
          toArray(data).forEach(function (value, key) {
            callback.call(data, value, key, data);
          });
        } else if (isObject(data)) {
        Object.keys(data).forEach(function (key) {
          callback.call(data, data[key], key, data);
        });
      }
    }
  
    return data;
  }
docs: Iterate the given data.
  @param {*} data - The data to iterate.
  @param {Function} callback - The process function for each element.
  @returns {*} The original data.