https://www.npmjs.com/package/shallowequal

    1. function shallowEqual(x, y) {
    2.   if (x === y) return true;
    4.   if (typeof x == "object" && x != null && typeof y == "object" && y != null) {
    5.     if (Object.keys(x).length != Object.keys(y).length) return false;
    7.     for (var prop in x) {
    8.       if (y.hasOwnProperty(prop)) {
    9.         if (x[prop] !== y[prop]) return false;
    10.       }
    11.       return false;
    12.     }
    13.     return true;
    14.   }
    15.   return false;
    16. }