Passing information: pass props from a stateful parent component to a stateless child component.

Passing information: pass props from a stateful parent component to a stateless child component.

• A. Update the child's internal state directly
• B. Pass props from the parent to the child component in its render
• C. Use the context API to pass information
• D. Use a global store to share data

Answer: (B)

In React, data flows from a stateful parent to a (stateless) child through props. The parent keeps the data in its state and passes it to the child during render, for example by writing <Child data={this.state.data} />. The child receives that data as props and renders based on it. Props are read-only for the child, so the child shouldn’t try to mutate them directly; if the child needs to signal a change, it can call a function passed from the parent (like onSomething) and let the parent update its state, which will re-render the child with the new props. While the context API or a global store can be useful for sharing data across many components or deeper trees, they’re not needed for the straightforward case of passing information from a single stateful parent to a stateless child. This direct prop passing is the simplest, idiomatic approach for that relationship.

In React, data flows from a stateful parent to a (stateless) child through props. The parent keeps the data in its state and passes it to the child during render, for example by writing . The child receives that data as props and renders based on it. Props are read-only for the child, so the child shouldn’t try to mutate them directly; if the child needs to signal a change, it can call a function passed from the parent (like onSomething) and let the parent update its state, which will re-render the child with the new props.

While the context API or a global store can be useful for sharing data across many components or deeper trees, they’re not needed for the straightforward case of passing information from a single stateful parent to a stateless child. This direct prop passing is the simplest, idiomatic approach for that relationship.