title: JavaScript: Calculate the nth root of a number
body: <p>I'm trying to get the nth root of a number using JavaScript, but I don't see a way to do it using the built in <code>Math</code> object. Am I overlooking something?<br>
  If not...</p>
  
  <p>Is there a math library I can use that has this functionality?<br>
  If not...</p>
  
  <p>What's the best algorithm to do this myself?</p>