title: Use of Function class in JavaScript
body: <p>I have seen usage like <code>var f1=new Function();</code> but no more than that. Tried to search in Google regarding <code>Function</code>-class but nothing returned what I needed.</p>
  
  <p>What is its significance?</p>
  
  <p>Please suggest me <strong>how and when</strong> to use it. If possible give me some genuine link to study about it.</p>