title: parseInt() is not a function
body: <p>When I try to parseInt() it says:</p>
  
  <blockquote>
    <p>_this2.state.grade.parseInt is not a function</p>
  </blockquote>
  
  <p>Code:</p>
  
  <pre><code>this.state = {grade: "1"}
  
  let grade = this.state.grade.parseInt()
  </code></pre>
  
  <p>Does this function not work in React Native? If so how can I convert it to int?</p>