code: function pickBy(object, predicate) {
    if (object == null) {
      return {};
    }
    var props = arrayMap(getAllKeysIn(object), function(prop) {
      return [prop];
    });
    predicate = baseIteratee(predicate);
    return basePickBy(object, props, function(value, path) {
      return predicate(value, path[0]);
    });
  }
docs: Creates an object composed of the `object` properties `predicate` returns
  truthy for. The predicate is invoked with two arguments: (value, key).
  
  @static
  @memberOf _
  @since 4.0.0
  @category Object
  @param {Object} object The source object.
  @param {Function} [predicate=_.identity] The function invoked per property.
  @returns {Object} Returns the new object.
  @example
  
  var object = { 'a': 1, 'b': '2', 'c': 3 };
  
  _.pickBy(object, _.isNumber);
  // => { 'a': 1, 'c': 3 }