Array of function objects with (potentially) asynchronous execution which keeps the result inside an object...

gistfile1.js

var sum = function (a, b, context) {
  var res = a+b;
  context.result = res;
};

var prod = function (a, b, context) {
  var res = a*b;
  context.result = res;
};

var funcObj1 = {
  alias: 'addition',
  func: sum,
  result: undefined
};

var funcObj2 = {
  alias: 'product',
  func: prod,
  result: undefined
};

var ops = [funcObj1, funcObj2];
var vals = [13, 5];

for (var i=0; i<ops.length; i++) {
  ops[i].func(vals[0], vals[1], ops[i]);
}

for (var i=0; i<ops.length; i++) {
  console.log('with context: '+ops[i].alias+'->'+ops[i].result);
}