title: Using react props in .map function
body: <p>Let's say I have the following render function on one of my components.
  From the parent element I have passed a <code>changeTid</code> prop function.</p>
  
  <p><strong>Parent:</strong></p>
  
  <pre><code>&lt;RequestsList data={this.state.data} changeTid={this.changeTid} /&gt;
  </code></pre>
  
  <p><strong>Child:</strong></p>
  
  <p>(I'm using ES6 classes)</p>
  
  <pre><code>render() {  
  var RequestNodes = this.props.data.map(function(request) {
    return (
      &lt;Request 
          key={request.TID} 
          changeTid={this.props.changeTid}
      /&gt;
    );
  });
  
      return (
          &lt;div className="list-group"&gt;{RequestNodes}&lt;/div&gt;
      );
  }
  </code></pre>
  
  <p>I can't use <code>this.props.changeTid</code> in my map function as <code>this</code> is not referencing what I wan't. Where do I bind it so I can access my <code>props</code>?</p>