title: Convert string to expression in JavaScript
body: <p>I am making a calculator in JavaScript and I want to know how to turn a string into an expression. </p>
  
  <pre><code>var numbers = "5+5+6";
  numbers = +numbers;
   document.querySelector('.screen').innerHTML = numbers;
  </code></pre>
  
  <p>Adding + before the variable does not seem to work. I would appreciate it if someone helped.</p>