How do I pass data from parent to child in React?
Pass the data as a prop on the child component in the parent's JSX, and read it from the props object inside the child. This is the default downward data flow in React.
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More FAQs in How to Pass Data Between React Components Using Props
Children cannot change parent state directly. The parent passes a callback function as a prop, and the child calls it with the new data. The parent updates its state, and the new data flows back down as props.
Siblings do not communicate directly. They share data through their common parent. One sibling sends data up via a callback, the parent stores it in state, and passes it down to the other sibling as a prop.
Prop drilling is passing props through many intermediate components to reach a deeply nested child. It becomes painful at scale, which is when the Context API is used to provide data without manual threading.
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