Instead of forEach()
use map()
to create an array of promises and then use Promise.all()
let promiseArr = arr.map(function (resource) {
// return the promise to array
return someModule.someFunction(resource).then(function (res) { //a Promise
//do something with the resource that has been modified with someFunction
return res;
})
});
Promise.all(promiseArr).then(function(resultsArray){
// do something after the loop finishes
}).catch(function(err){
// do something when any of the promises in array are rejected
})