| Underscore Function | 
Count | 
Percentage vs filter | 
| _.filter | 
427,420 | 
 | 
| _.select | 
8,743 | 
2% | 
| _.reject | 
64,018 | 
15% | 
| _.partition | 
7,013 | 
1.6% | 
Using the following query format:
SELECT
  COUNT(*)
FROM
  `httparchive.response_bodies.2019_10_01_desktop`
WHERE
  REGEXP_CONTAINS(body, r"_\.filter\(")