react js how to create element code example

Example 1: react memo

function MyComponent(props) {
  /* render using props */
}
function areEqual(prevProps, nextProps) {
  /*
  return true if passing nextProps to render would return
  the same result as passing prevProps to render,
  otherwise return false
  */
}
export default React.memo(MyComponent, areEqual);

Example 2: react createElement interactive button

let welcome = React.createElement(
  "h1",
  { style: { color: "red" } },
  `Welcome to react world`
);

ReactDOM.render(welcome, document.querySelector("#root"));