ProtoTypes in react?

• If you are developing big projects, you can catch a lot of bugs with typechecking

• React has some built-in typechecking abilities          

 Ex:
we’re using PropTypes.string. When an invalid value is provided for a prop, a warning will be shown in the JavaScript console.

What is map() in react?

• Higher order array method

• Basically this is used for return array from an array.

   

  Ex:

  const numbers = [5, 10, 15, 20, 25];
  const doubled = numbers.map((number) => number / 5);
  console.log(doubled);