Ruby - Arrays
Which of the following is the correct syntax to remove nil values from an array arr without changing arr itself?
arr = [1, nil, 2, nil, 3]
Which of the following is the correct syntax to remove nil values from an array arr without changing arr itself?
easy📝 Syntax Q12 of 15
Step-by-Step Solution
Solution:
Step 1: Identify method that returns new array without nil
compactreturns a new array withoutnilvalues and does not modify the original array.Step 2: Understand difference with
compact!compact!modifies the original array, so it changesarr.delete(nil)removes nil but modifiesarr.remove_nilis not a Ruby method.Final Answer:
arr.compact -> Option DQuick Check:
compact returns new array, compact! modifies [OK]
Quick Trick: Use compact for new array, compact! to modify original [OK]
Common Mistakes:
- Using compact! when original array should stay unchanged
- Using delete(nil) which modifies the original array
- Assuming remove_nil is a valid Ruby method
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