/*
    Will return true for Plain objects and class instances, false for everything else
*/

const isObject = value => {
  const strVal = Object.prototype.toString.call(value);
  return strVal.split(' ')[1].replace(']', '') === 'Object';
}

isObject(null); // false
isObject('object') // false
isObject(String('object')) // false
isObject(class MyClass {}) // false
isObject() //false
isObject([]) // false

class MyClass {}
class SubClass extends MyClass {}

isObject({}) // true
isObject(new MyClass()) // true
isObject(new SubClass()) // true