code: function pairs(object) {
      var index = -1,
          props = keys(object),
          length = props.length,
          result = Array(length);
  
      while (++index < length) {
        var key = props[index];
        result[index] = [key, object[key]];
      }
      return result;
    }
docs: Creates a two dimensional array of an object's key-value pairs,
  i.e. `[[key1, value1], [key2, value2]]`.
  
  @static
  @memberOf _
  @category Objects
  @param {Object} object The object to inspect.
  @returns {Array} Returns new array of key-value pairs.
  @example
  
  _.pairs({ 'barney': 36, 'fred': 40 });
  // => [['barney', 36], ['fred', 40]] (property order is not guaranteed across environments)