group_by sql vs js

write.js

SELECT COUNT(MOVIES.ID), MOVIES.DIRECTOR

FROM MOVIES

GROUP BY MOVIES.DIRECTOR







movies = [{ id: 5, director: 'a' }, { id: 8, director: 'a' }, { id: 3, director: 'b' }]



//=> [{ amount: 2, director: 'a' }, { amount: 1, director: 'b' }]



function group_by(field){



}



movies.group_by()