Update object properties with values from another object.

updateObjectWithObject.js

var objA = {
    "a" : 1,
    "b" : 2
  },
  objB = {
    "a" : 3,
    "c" : 4
  };

var updateObj = function (a, b) {
  var aKeys = Object.keys(a);
  aKeys.forEach(function (aKey) {
    if (typeof b[aKey] !== "undefined" && b[aKey] !== "") {
      a[aKey] = b[aKey];
    }
  });
  return a;
}
var updatedObj = updateObj(objA, objB);
console.log(updatedObj);