left outer join in RethinkDB using javascript syntax

gistfile1.js

r.db("gather").table("contacts").filter({Company: "yiq5yon7"}).concatMap(function(contact) {
  return r.db("gather").table("accounts").getAll(contact("Account").default("")).coerceTo("array").do(function(accounts) {
    return r.branch(
      accounts.isEmpty(),
      [ { left: contact, right: null } ],
      accounts.map(function(account) {
        return { left: contact, right: account }
      })
    );
  });
});

Thanks! This totally helped, because the official docs (here https://www.rethinkdb.com/docs/sql-to-reql/javascript/) weren't working.