React 16 Course – Managing State by @SatansDeer #javascript #reactjs via @JavaScriptKicks

  • in react is a plain javascript object used to manage data specific to some component.
  • So basically is a plain javascript object where component stores relevant data.
  • The difference between and any other object you can store inside your component is that React monitors it and will trigger re-render on update.
  • Here is the diagram: – – There are several methods of defining the initial state of your component.
  • First rule is – don’t update directly: – – There is only one exception for setting state directly – you can define your initial state in your constructor – – In all other places instead.

state in react is a plain javascript object used to manage data specific to some component. Keep in mind that only data that is going to be rendered should belong to the state.

in react is a plain javascript object used to manage data specific to some component. Keep in mind that only data that is going to be rendered should belong to the state.

So basically is a plain javascript object where component stores relevant data. The difference between and any other object you can store inside your component is that React monitors it and will trigger re-render on update.

As state updates cause re-render – it makes sense to only store variables that are needed for rendering. So if you have some variable related to the component, but that you don’t use in your method – it makes sense to just use it as a regular instance variable and not put it into .

Also, consider as private to the component. So you can only access or update from inside the component. You can’t access it from its parent nor from its children.

Just like – is an object and it causes the component to re-render when updated. The difference is that come from parent component and is internal to the component.

Also, you can’t update props inside component itself. Basically come from outside and component has no control over it, and is internal and component fully controls it.

Here is the diagram:

There are several…

React 16 Course