class02
React lifecycle
Based off the diagram, what happens first, the ‘render’ or the componentDidMount ? Based off the diagram the ‘render’ happens before the ‘componentDidMount’.
What is the very first thing to happen in the lifecycle of React ? Render phase
Put the following things in the order that they happen: componentDidMount, render, constructor, componentWillUnmount, React Updates :-
- Constructor.
- Render.
- React Updates.
- ComponentDidMount.
- ComponentWillUnmount.
What does componentDidMount do ? This method is invoked immediately after a component is mounted. If you need to load anything using a network request or initialize the DOM, it should go here. This method is a good place to set up any subscriptions.
What types of things can you pass in the props ? Props are pass into the component.
What is the big difference between props and state ?
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Props pass into a component.
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Props is handled outside of that component.
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Props is update it outside the component.
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State is handled inside of that component.
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State is update it inside the component.
When do we re-render our application ?
Based on something the user has done.
What are some examples of things that we could store in state ?
Based on user input :
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Input Elements.
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Check Box.
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Select Box.
