how does the map function work in react code example

Example 1: map function in react

function NameList() {
	const names = ['Bruce', 'Clark', 'Diana']
    return (
    	<div>
      {names.map(name => <h2>{name}</h2>)}
      	</div>
    )
}

Example 2: how map work in react

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