react native how to pass id from list to function

1render(){
2    return(
3      <ul id="todo">
4      {this.state.items.map((item,i) => 
5        <li className='list-group-item' key={i} data-id={item.id}>{item.name}
6        <button onClick={() => this.yourfunc(item.id)}>X</button>
7        </li>
8      )}
9      </ul>
10    ) 
11}
12