Get object constructor name (class name) in IE

getClassName.js

let getClassName = obj => {
  if (obj.constructor.name) {
    return obj.constructor.name;
  }
  const regex = new RegExp(/^\s*function\s*(\S*)\s*\(/);
  getClassName = obj => obj.constructor.toString().match(regex)[1];
  return getClassName(obj);
};