something.map reactjs code example

Example 1: react map

{array.map((item)=>{
  return (
    <div key={item.id}>I am one Object in the Array {item}</div>
  )
})}

Example 2: new Map() collection in react state

function MapComponent(){
  const [myMap, setMyMap] = useState(new Map());
  const updateMap = (k,v) => {
    setMyMap(new Map(myMap.set(k,v)));
  }
  return(
    <ul>
      {[...myMap.keys()].map(k => (
        <li key={k}>myMap.get(k)</li>
      ))}
    </ul>
  );
}