Who can change a prop value?

Who can change a prop value?

• A. The Parent Component
• B. The Child Component
• C. The React Runtime
• D. Any Component

Answer: (A)

In React, data flows from parent to child through props and props are read-only for the child. The value of a prop is controlled by the component that owns it—the parent. When the parent updates its own state and passes a new value down, the child receives that updated prop on the next render. The React runtime does not mutate props by itself. If a child needs to trigger a change, it does so by calling a function provided by the parent (a callback), and the parent then updates its state and passes the new prop value down. So the parent component is the one that can change a prop value.

In React, data flows from parent to child through props and props are read-only for the child. The value of a prop is controlled by the component that owns it—the parent. When the parent updates its own state and passes a new value down, the child receives that updated prop on the next render. The React runtime does not mutate props by itself. If a child needs to trigger a change, it does so by calling a function provided by the parent (a callback), and the parent then updates its state and passes the new prop value down. So the parent component is the one that can change a prop value.