Equals.js

  const equals = (a, b) => {
      if (a === b) return true;
      if (a instanceof Date && b instanceof Date) return a.getTime() === b.getTime();
      if (!a || !b || (typeof a !== 'object' && typeof b !== 'object')) return a === b;
      if (a === null || a === undefined || b === null || b === undefined) return false;
      if (a.prototype !== b.prototype) return false;
      let keys = Object.keys(a);
      if (keys.length !== Object.keys(b).length) return false;
      return keys.every(k => equals(a[k], b[k]));
  };

  console.log(equals({ a: 1, b: 2}, { b: 2, a: 1}))