Frage 52

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

It returns the first qualifying indexRichtige Antwort
It returns undefined when nothing qualifies
It returns -1 when nothing qualifiesRichtige Antwort
It returns every qualifying index

Erklärung

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.

Erklärung

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