title: How to concatenate variable inside function name?
body: <p>I have this code:</p>
  
  <pre><code>var a = 1;
  
  function test + a() {
      alert('test');    
  }
  
  test1();
  </code></pre>
  
  <p>I've received this error from the browser console:</p>
  
  <pre><code>Uncaught SyntaxError: Unexpected token +
  </code></pre>
  
  <p>So how can I concatenate the variable <code>a</code> to <code>test</code> which finally run function <code>test1</code> here?</p>
  
  <p><strong><a href="http://jsfiddle.net/qbmd67mq/" rel="nofollow">jsFiddle</a></strong></p>