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What does the length method do when called on an array in Ruby?

easy📝 Conceptual Q11 of 15
Ruby - Arrays
What does the length method do when called on an array in Ruby?
AReturns the number of elements in the array
BChecks if an element exists in the array
CFlattens nested arrays into a single array
DRemoves duplicate elements from the array
Step-by-Step Solution
Solution:

  1. Step 1: Understand the purpose of length

    The length method counts how many items are inside an array.

  2. Step 2: Compare with other methods

    include? checks for presence, flatten merges nested arrays, so they do different things.

  3. Final Answer:

    Returns the number of elements in the array -> Option A

  4. Quick Check:

    length = count items [OK]
Quick Trick: Remember length counts items, not checks or changes arrays [OK]
Common Mistakes:
  • Confusing length with include? method
  • Thinking length flattens nested arrays
  • Assuming length removes duplicates

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