React · Junior · Question 25 of 75

When does an effect without a dependency array run: `useEffect(() => { ... })`?

1Only once - right after the component mounts
✓Correct answer: After every render of the component
3Never: without a dependency array the effect doesn't run

Explanation

Without the second argument, the effect runs after every render. With [] - only after mounting. With [a, b] - after mounting and whenever a or b changes (compared via Object.is).

When does an effect without a dependency array run: `useEffect(() => { ... })`?

Explanation

Further reading

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When does an effect without a dependency array run: useEffect(() => { ... })?

Explanation

Further reading

Test yourself

When does an effect without a dependency array run: `useEffect(() => { ... })`?