Parallel function calls in Node.js

Question

I need to do a few independent database queries in Node.js. After all queries are executed, response should be sent. My first try looks like this:

templateDa         


        

Answer 1

Use the async package: (npm install async)

async.parallel([
    function(){ ... },
    function(){ ... }
], callback);

https://github.com/caolan/async#parallel

Alternatively, you can use promises:

Q.spread(
    [ model.getA(), model.getB(), model.getC() ],
    function(a, b, c) {
        // set templateData
        return templateData;
    }
).then(...);

(assuming that the get*() methods return promises)