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Why does Ruby's zip method fill missing elements with nil when arrays differ in length?

hard📝 Conceptual Q10 of 15
Ruby - Enumerable and Collection Processing
Why does Ruby's zip method fill missing elements with nil when arrays differ in length?
ATo keep the zipped array length equal to the receiver array's length
BBecause Ruby automatically converts missing values to nil for all methods
CTo raise an error if arrays are not the same length
DTo remove extra elements from the longer array
Step-by-Step Solution
Solution:

  1. Step 1: Understand zip's length behavior

    The zipped array length matches the receiver (first) array's length.

  2. Step 2: Reason why nil fills missing

    Nil fills missing to maintain consistent length and pairing.

  3. Final Answer:

    To keep the zipped array length equal to the receiver array's length -> Option A

  4. Quick Check:

    Zip length = receiver length, missing filled with nil [OK]
Quick Trick: Zip length matches first array; missing filled with nil [OK]
Common Mistakes:
  • Thinking zip raises error on length mismatch
  • Believing Ruby fills missing with default values
  • Assuming zip truncates longer array

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