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Question 52

Which statements about findIndex are true? Select all that apply.

  1. It returns the first qualifying indexBonne réponse
  2. It returns undefined when nothing qualifies
  3. It returns -1 when nothing qualifiesBonne réponse
  4. It returns every qualifying index

Explication

findIndex reports the index of the first element whose callback is truthy, and it reports -1 when none qualifies. Returning undefined is the no-match behavior associated with find, not findIndex.

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Question 52: Which statements about findIndex are true? Select all that… · JavaScript Fundamentals · Questena