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;
    }
Creates a two dimensional array of the key-value pairs for `object`,
e.g. `[[key1, value1], [key2, value2]]`.

@static
@memberOf _
@category Object
@param {Object} object The object to inspect.
@returns {Array} Returns the new array of key-value pairs.
@example

_.pairs({ 'barney': 36, 'fred': 40 });
// => [['barney', 36], ['fred', 40]] (iteration order is not guaranteed)