The previous challenges covered a lot about creating and composing JSX elements, functional components, and ES6 style class components in React. With this foundation, it's time to look at another feature very common in React: **props**. In React, you can pass props, or properties, to child components. Say you have an `App` component which renders a child component called `Welcome` which is a stateless functional component. You can pass `Welcome` a `user` property by writing:
You use **custom HTML attributes** created by you and supported by React to be passed to the component. In this case, the created property `user` is passed to the component `Welcome`. Since `Welcome` is a stateless functional component, it has access to this value like so:
It is standard to call this value `props` and when dealing with stateless functional components, you basically consider it as an argument to a function which returns JSX. You can access the value of the argument in the function body. With class components, you will see this is a little different.
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There are `Calendar` and `CurrentDate` components in the code editor. When rendering `CurrentDate` from the `Calendar` component, pass in a property of `date` assigned to the current date from JavaScript's `Date` object. Then access this `prop` in the `CurrentDate` component, showing its value within the `p` tags. Note that for `prop` values to be evaluated as JavaScript, they must be enclosed in curly brackets, for instance `date={Date()}`.