title: what is the alternative of angular.isString() in angular2?
body: <p>I am working on a project in angular2 and curious to know if there is any mean by which I can use angularjs functionalities in my angular2 application.</p>
  
  <p>for ex.</p>
  
  <p><strong>in angularjs</strong>, I used to do following operations:</p>
  
  <ol>
  <li><em>angular.isString(value)</em></li>
  <li><em>angular.isArray(value)</em></li>
  <li><em>angular.copy(value)</em></li>
  </ol>
  
  <p>I just want to know that is there any module or package which can help me do above operations <strong>in angular2/typescript</strong>?</p>
  
  <p>Thanks in advance.</p>