With React, you won’t modify the UI from code directly. For example, you won’t write commands like “disable the button”, “enable the button”, “show the success message”, etc. Instead, you will describe the UI you want to see for the different visual states of your component (“initial state”, “typing state”, “success state”), and then trigger the state changes in response to user input. This is similar to how designers think about UI.
== 備忘メモ ==
hoge
Here is a quiz form built using React. Note how it uses the <code>status</code> state variable to determine whether to enable or disable the submit button, and whether to show the success message instead.
