dictionary - How to use a map to fire async request but get an aggregated result? -

i have code:

import 'dart:async';  future<int> expensivecallfromalib(int value) async {   print('expensivecall($value)');   return value + 1; }  test() {   map<string, int>input = {"one":1, "two":2};   map result = {};    print("a");   input.foreach((string key, int value) {     expensivecallfromalib(value).then((int value) {       result[key] = value;     });     print("b");   });   print("c");    print(result);  }  main() {   test(); } 

... output

a b b c {} expensivecall(1) expensivecall(2) 

... want

a b expensivecall(1) b expensivecall(2) c {one: 2, two: 3} 

the point is, cant change expensivecallfromalib method.

test() async {   map<string, int>input = {"one":1, "two":2};   map result = {};    print("a");   for(final key in input.keys) {     int value = await expensivecallfromalib(input[key]);       result[key] = value;      print("b");   }   print("c");   print('result: $result'); } 

the output not how want guess it's close enough ;-)

html output console expensivecall(1) b expensivecall(2) b c result: {one: 2, two: 3} 

plunker example