reading-notes
These are my reading notes for Code Fellows
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Component Lifecycle / useEffect() Hook
- How can we ensure that an effect hook runs only once?
The second param is an array of variables that the component will check to make sure changed before re-rendering. You could put whatever bits of props and state you want in here to check against. Or, put nothing… That will ensure the useEffect only runs once.
- Can useState() update more than one state variable at the same time?
Yes
- Is useState() synchronous?
No
Document the following Vocabulary Terms:
- State Hook
…a Hook that lets you add React state to function components. (source)
- Component Lifecycle
Initialization > mounting > updating > unmounting
Initialization: “This is the stage where the component is constructed with the given Props and default state. This is done in the constructor of a Component Class.”
Mounting: “Mounting is the stage of rendering the JSX returned by the render method itself.”
Updating: “Updating is the stage when the state of a component is updated and the application is repainted.”
Unmounting: “As the name suggests Unmounting is the final step of the component lifecycle where the component is removed from the page.”
