react js array how to change select element data 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: map array to a select tag

var Answer = props => 
    <select>{props.data.map((x,y) => <option key={y}>{x}</option>)}</select>;