node.js - NodeJS + async: which control flow option to chose? -

as know, async.parallel, defined such code:

async.parallel([     function (callback) {         callback(err, objects);     },     function (callback) {         callback(err, status);     },     function (callback) {         callback(err, status);     }, ], function (err, results) {     //smth results[n] array... }); 

performs tasks parallel. however, need callback result of first function (objects, exact) avialable in 2nd , 3rd functions. in other words, first step – 1st function, second – ( 2rd + 3rd parallel results of 1st one). async.waterfall seems bad idea 'cause:

1. in waterfall function can't work parallel
2. i can't access every result of stack, last.

any ideas? thanks!

you need both waterfall , parallel.

function thing1(callback) {...callback(null, thing1result);} function thing2a(thing1result, callback) {...} function thing2b(thing1result, callback) {...} function thing2(thing1result, callback) {     async.parallel([       async.apply(thing2a, thing1result),       async.apply(thing2b, thing1result)     ], callback); } async.waterfall([thing1, thing2], function (error) {     //all done });