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سؤال 46

Which test reliably distinguishes an array value from an ordinary non-array object?

  1. value === Array
  2. typeof value === "array"
  3. value.length is defined
  4. Array.isArray(value)پاسخ درست

توضیح

Array.isArray returns true for arrays and false for ordinary objects that are not arrays. typeof cannot make this distinction because both values produce object in that operator's classification.

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شروع تمرین
سؤال 46: Which test reliably distinguishes an array value from an… · JavaScript Fundamentals · Questena