title: How can I check if a string is a float?
body: <p>I am passing in a parameter called value. I'd like to know if value is a float.
  So far, I have the following:</p>
  
  <pre><code>if (!isNaN(value))
  {
      alert('this is a numeric value but not sure if it is a float.');
  }
  </code></pre>
  
  <p>How do I go one step further and convert the string to something that can evaluate to a float?</p>