Original subtitles

[Maximilian Schwarzm�ller] So React Context is great.

Let's use it for everything.

Well, not quite.

For one, keep in mind what I mentioned earlier.

It can be great for app-wide or component-wide state.

So essentially states that affects multiple components.

It's not a replacement for component configuration.

Consider our button here in the UI folder.

The button should be reusable.

Sure, we could use Context to make sure that upon a click

we always logged the user out,

but that would mean that we can't use the button

for anything else than logging users out.

And that might not be what you want.

For example, in this application,

we are using the same button component

in the log in component to log the user in

and triggered the form submission

as well as we're using it in the home component

to log the user out.

So that is a scenario where using Context

in the button component would be bad.

You wanna use props here to configure the button.

So props for configuration, context for state management

across components or possibly across the entire app.

But even then we have limitations,

React Context is specifically not optimized

for high frequency changes.

So that means, for example, if you have state changes

every second or multiple times per second,

this is clearly not the case in our example here

for authentication.

That does not change that often,

it changes once every few minutes in reality,

maybe not even that.

So that is a perfect use case for Context.

But if you had state changes

that happen much more frequently,

again, talking about multiple changes per second and so on,

then React Context is not optimized for that

and you don't have to take this for me.

This is actually something that was stated

by the official React team member.

So it's not great for high-frequency changes.

Now, you might wonder, "Okay, but what if I have app-wide

"or a component-wide state that changes often?"

I would want to use Context for that.

Props might not be ideal,

and you're telling me that it's bad.

We'll explore a better tool for that later.

No worries.

It will be called Redux and I'll have a whole section on it.

And as I mentioned, it should not be used

to replace all component communications on props.

Props are still vital and important

for component configuration.

So you should still use props for that

and not use Context for everything.

For replacing long prop chains

it might however be worth the look.