how to loops array dimentional with react code example

Example 1: double matrix iteration in react

{Object.map(keyOuter => {
  return Object.map(keyInner => {
    return (
       //Do your stuff
    );
  });
})}

Example 2: react loop through array

this.items = this.state.cart.map((item, key) =>    <li key={item.id}>{item.name}</li>);