السؤال 52

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

It returns the first qualifying indexالإجابة الصحيحة
It returns undefined when nothing qualifies
It returns -1 when nothing qualifiesالإجابة الصحيحة
It returns every qualifying index

الشرح

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.

الشرح

تابع هذا الاختبار