Ruby - Arrays
Which Ruby code correctly creates a new array containing only the odd numbers from the original array?
numbers = [10, 15, 20, 25, 30]
Which Ruby code correctly creates a new array containing only the odd numbers from the original array?
hard📝 Application Q8 of 15
Step-by-Step Solution
Solution:
Step 1: Understand the goal
We want a new array with only odd numbers from the original.Step 2: Analyze options
odd_numbers = numbers.select { |n| n.odd? } uses 'select' with 'odd?' which filters and keeps odd numbers correctly.Step 3: Why others are wrong
odd_numbers = numbers.reject { |n| n.odd? } rejects odd numbers (keeps even), C maps but returns nil for even numbers, D deletes odd numbers from original array (modifies in place).Final Answer:
odd_numbers = numbers.select { |n| n.odd? } -> Option DQuick Check:
'select' filters elements based on condition [OK]
Quick Trick: Use 'select' with condition to filter arrays [OK]
Common Mistakes:
MISTAKES- Using 'reject' instead of 'select' for filtering
- Using 'map' which transforms but doesn't filter
- Modifying original array instead of creating new
Master "Arrays" in Ruby
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