generate-all-possible-combinatons-of-args.js

function generateAllCombinations(listsOfArgs) {  
  return listsOfArgs.reduce((acc, list) => mix(acc, list), []);
}

function mix(listA, listB) {
  if (listA.length === 0) return listB;
  if (listB.length === 0) return listA;

  const result = [];

  listA.forEach(itemA => {
    listB.forEach(itemB => {
      result.push(
        (Array.isArray(itemA) ? itemA : [itemA]).concat(itemB)
      );
    })
  });

  return result;
}

console.log(
  generateAllCombinations([
    [ 'Robert', 'Ian', 'Nick' ],       // firstName
    [ 'Smith', 'Curtis', 'Johnson' ],  // lastName
    [ 23, 32, 45, 52 ],                // age
    [ 'France', 'Germany' ]            // country
  ])  
);