title: can't pass this using arrow function in react?
body: <p>I got undefined value passing <strong>e</strong> using arrow function</p>
  
  <pre><code>&lt;input type="checkbox" onChange={e=&gt; this.handleCheck(this, 123)} /&gt;
  
  handleCheck = (e, number) =&gt; {
  console.log(number) //123
  console.log(e.target.checked) //undefined
  console.log(e.target) //undefined
  }
  </code></pre>
  
  <p>What's wrong?</p>