In ReactJs, when rendering a matrix based on a 2d array, the function is not visible for the cell element, how to deal with this?

Question

React

There is a suspicion that due to 2 return-s, the updateMatrix function is not visible to the cell element, how to deal with this?

var Matrix = React.createClass({
        getInitialState: function(){
          return {
            arr: A
          };
        },
        updateMatrix: function(arr){
          this.setState({
            arr: arr
          });
        },
        render: function(){
          return <table className="Matrix">
            <tbody>
              {this.props.arr.map(function(row, i){
                return (
                  <tr key={i}>
                    {row.map(function(cell, j){
                      return <td key={j}><Cell  val={cell} action={this.updateMatrix} /></td>;
                    })}
                  </tr>
                );
              })}
            </tbody>
          </table>
        ;}
      });