30-seconds-of-code/snippets/DataList.md

DataList

Renders a list of elements from an array of primitives.

• Use the value of the isOrdered prop to conditionally render a <ol> or <ul> list.
• Use Array.prototype.map to render every item in data as a <li> element, give it a key produced from the concatenation of the its index and value.
• Omit the isOrdered prop to render a <ul> list by default.

function DataList({ isOrdered, data }) {
  const list = data.map((val, i) => <li key={`${i}_${val}`}>{val}</li>);
  return isOrdered ? <ol>{list}</ol> : <ul>{list}</ul>;
}

const names = ['John', 'Paul', 'Mary'];
ReactDOM.render(<DataList data={names} />, document.getElementById('root'));
ReactDOM.render(<DataList data={names} isOrdered />, document.getElementById('root'));