The base implementation of  `_.pickBy` without support for iteratee shorthands.

@private
@param {Object} object The source object.
@param {string[]} props The property identifiers to pick from.
@param {Function} predicate The function invoked per property.
@returns {Object} Returns the new object.
function basePickBy(object, props, predicate) {
  var index = -1,
      length = props.length,
      result = {};

  while (++index < length) {
    var key = props[index],
        value = object[key];

    if (predicate(value, key)) {
      baseAssignValue(result, key, value);
    }
  }
  return result;
}