السؤال 113

What happens when reduce is called on an empty array without supplying an initial accumulator value?

It throws a TypeErrorالإجابة الصحيحة
It returns undefined
It returns zero for every reducer
It skips the call and returns the empty array

الشرح

With no elements and no explicit initial value, reduce has nothing from which to establish its accumulator, so it throws a TypeError. Supplying an initial value would make that value the result for the empty array instead.

الشرح

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