how to map through options in react code example

Example 1: select the items from selectors in .map reactjs

{this.props.categories((items , index)=>{
  <option key{index}>{items.categoryName} </option>
})}

Example 2: select the items from selectors in .map reactjs

{this.props.categories.map((items , index)=>{
  <option key{index}>{items.categoryName} </option>
})}

Example 3: how map work in react

{this.state.data.map((person) => <TableRow key = {shortid.generate()} data = {person} />)}