var foo = ""
var bar = ""

start();
final();

//###########################

function start() {
  something_1();
  something_2();
}

function something_1() {
   anything_A(params, function(err, data){ foo = "hello" });
}

function something_2() {
    anything_B(params, function(err, data){ bar = "world" });
}

fucntion final() {
  console.log(foo + " " + bar);
}