title: Syntax for executing a returned function
body: <p>If I return a function from a function as shown below, how do I execute it and set the parameter?</p>
  
  <pre><code>var func1 = function(param){
      // do stuff
  };
  
  function returnFunction(){
      return func1;
  }
  
  returnFunction() // this will return func1 but I want to execute it with certain param.
  </code></pre>