- 
Initialization that requires DOM nodes should go here.
- be known
 
 - 
If you need to load data from a remote endpoint, this is a good place to instantiate the network request.
- Why not in constructor?
 - What happens when a component is created with functions and Hooks instead of classes?
 
 
This page is auto-translated from /nishio/componentDidMount using DeepL. If you looks something interesting but the auto-translated English is not good enough to understand it, feel free to let me know at @nishio_en. I’m very happy to spread my thought to non-Japanese readers.