Use PropTypes to Define the Props

Use PropTypes to Define the Props
0

#1

Tell us what’s happening:
“isRequired” means?? “number type is required” or “quantity prop is required” ??

Below is the error that showed up, when isRequired is not mentioned in the code

// running test
The Items component should include a propTypes check that requires quantity to be a number.
// tests completed

Your code so far


const Items = (props) => {
  return <h1>Current Quantity of Items in Cart: {props.quantity}</h1>
};

// change code below this line
Items.propTypes ={quantity : PropTypes.number.isRequired}
// change code above this line

Items.defaultProps = {
  quantity: 0
};

class ShoppingCart extends React.Component {
  constructor(props) {
    super(props);
  }
  render() {
    return <Items quantity={10}/>
  }
};

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.79 Safari/537.36.

Link to the challenge:
https://learn.freecodecamp.org/front-end-libraries/react/use-proptypes-to-define-the-props-you-expect


#2

The second - it throws an error when the error has not been passed.

// You can chain any of the above with isRequired to make sure a warning
// is shown if the prop isn’t provided.