1. React data flows one way: parent → child

✔️ True
❌ False

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2. Why is one-way data flow important?

✔️ It ensures that the data is flowing from top to bottom in the component hierarchy.
❌ It ensures data flows bottom to top.

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3. State is data inside a component that it can mutate

✔️ True
❌ False

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4. What is prop drilling?

✔️ Passing data parent → child → grandchild → … to deeper levels
❌ Passing data child → parent → ancestor

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5. Stateless components don’t have state

✔️ True
❌ False

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6. Correct statement about props

❌ Props are mutable
✔️ Props are immutable (you should never change them)

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7. Is this code valid?

✔️ Yes
❌ No

(Button uses onClick={handler} → completely valid)

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8. Is this code valid?

✔️ Yes
❌ No

(Inline arrow function is also valid)

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9. Correct statement about useState

✔️ … lets you hook into React state and lifecycle features from a component.
❌ … imported from third-party
❌ … update function must follow a naming rule
❌ … should never be called at top level

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10. Context API allows you to:

✔️ Avoid passing state down through many levels (avoid prop drilling)
❌ Avoid return statement
❌ Avoid modularity

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📘 Summary Table

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