Simple sum of promises

reduce.js

var Q = require('q');

var myarr = [1,2,3,4,5];

Q.resolve(myarr).then(function (results) {
    return results.reduce(function (prev, current) {
        console.log(prev, current);
        return prev + current;
    })
}).then(function (sum) {
    console.log(sum);
});