React and React Native

Type and value validators

In this section, we'll look at the more advanced validator functionality available in the React PropTypes facility. First, you'll learn about the element and node validators that check for values that can be rendered inside HTML markup. Then, you'll see how to check for specific types, beyond the primitive type checking you saw in the previous section. Finally, we'll implement validation that looks for specific values.

Things that can be rendered

Sometimes, you just want to make sure that a property value is something that can be rendered by JSX markup. For example, if a property value is an array, this can't be rendered by putting it in {}. You have to map the array items to JSX elements.

This sort of checking is especially ...