I'm new to react, and having a lot of trouble understanding why this code doesn't work. All I am trying to do is create a list of 5 0's and render them as list elements in my render method, but I'm getting this error.

```
import React, { Component } from "react";

class Matrix extends Component {
  state = {
    elements: this.createList()
  };

  render() {
    return;
    <div>
      <ul>{this.state.elements.map(e => <li>{e}</li>)}</ul>
    </div>;
  }
  createList() {
    var myList = [];
    var i;
    for (i = 0; i < 5; i++) {
      myList[i] = 0;
    }
    return myList;
  }
}

export default Matrix;

```