ReactJS quiz medium level

Test description

This test was designed to evaluate the knowledge of React developers at a medium level.
Topics include: Hooks, Ref, Context and Performance Optimization.

Sample questions

1
Identify the code that defines a cleanup for a `useEffect` hook. For example: unsubscribing from a stream or removing an event listener.

useEffect( ()=> {
      // useful code
return () => {
//cleanup
}
})

useEffect( ()=> {
// useful code
}, [//cleanup])

useEffect( ()=> {
      // useful code
// cleanup
})

useEffect((end) => {
    // useful code
  end(() => {
    // cleanup
  });
});

Results between 1-5 / 20	8.12%
Results between 6-10 / 20	26.4%
Results between 11-15 / 20	42.29%
Results between 16-20 / 20	23.18%
Average results 11 / 20

ReactJS quiz medium level

Test description

Sample questions

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